List of 9-1-1 episodes

Los Angeles emergency first responders and dispatchers must balance the pressures of their respective jobs with their personal lives, from 9-1-1 operator Abby Clark (Connie Britton)'s mother (Mariette Hartley) having dementia to police sergeant Athena Grant (Angela Bassett)'s husband Michael (Rockmond Dunbar) deciding to reveal to his children that he is actually gay. Rookie firefighter Evan "Buck" Buckley (Oliver Stark) learns to appreciate the meaning of the job.

A failed rescue from a roller coaster leaves Buck traumatized. Athena and Henrietta Wilson (Aisha Hinds) respond to a devil dog attack, which Athena later discovers is actually a home invasion robbery. Abby makes an on-the-phone connection with Buck. Athena arrives home and finds that her daughter (Corinne Massiah) has overdosed.

The team is tested when Howie "Chimney" Han (Kenneth Choi) is critically injured in a car accident after a heated discussion with Captain Bobby Nash (Peter Krause). Tatianna, Chimney's girlfriend, refuses to see Chimney in the hospital. Athena learns the reason for her daughter's suicide attempt and takes matters into her own hands.

A plane crash into the ocean calls out the entire team. Athena takes drastic action to protect her daughter and, in doing so, is confined to desk duty. Bobby relapses into his alcoholism. Abby deals with a serious crisis involving her mother.

A building collapses during a big Hindu wedding. Henrietta's convict ex-girlfriend, Eva (Abby Brammell), asks for her help getting parole, upsetting Karen (Tracie Thoms), Hen's wife. Abby tries to find her missing mother with Buck's help, finally finding her thanks to some unlikely assistance. Bobby tells his confessor how he accidentally killed his family five years before when, under the effects of oxycodone and alcohol, he forgot to turn off a propane space heater which malfunctioned and caused his building to burn down.

A surprise marriage proposal on a Cessna goes awry. Buck invites Abby to Chimney's welcome back party at the firehouse. On Valentine's Day, Bobby and Chimney pull holiday duty so Buck can go on his first date with Abby, but the date goes awry when he chokes on some bread and she has to ask 911 for help performing an emergency tracheotomy. After she races to deliver an organ for transplant, Athena has to deal with an unhinged woman who murdered her cheating boyfriend.

A full moon looms over Los Angeles, putting everyone on high alert. Bobby and Buck respond to a call when a woman goes into labor during her yoga class. Hen gets too close for comfort with Eva, while Abby helps solve a mystery after a 911 call turns deadly.

The firefighting team deals with several calls that lead to backfiring results. Meanwhile, Bobby donates blood at a blood drive, only to find out that he has superior blood that could save lives. Athena moves forward with her divorce following a heart-to-heart with her children. Abby and Buck take their relationship to the next level. Hen's infidelity comes to light.

The team gets calls from a homeless man stuck in a garbage truck after falling asleep in a dumpster and a mother and a son trapped inside a flooding elevator. Meanwhile, Buck begins to have doubts about his relationship with Abby and Henrietta continues to deal with a custody battle against her wife. Also, Athena gets into an embarrassing situation while on a date. Rebecca Wisocky and Cocoa Brown guest star.

The team deals with a reported "death" at a psychic parlor; the victim later awakens at the morgue and reveals that he suffers from a disease in which he is paralyzed awake. They later respond to a motorcycle accident in which the victim's body has been severed in two, bringing Bobby and Athena closer together. Meanwhile, Buck's identity gets stolen through a series of social media accounts but, due to certain circumstances, he deals with the "catfisher" more sympathetically than expected. Following her mother's death, Abby makes a decision to leave Los Angeles and travel to Ireland to fulfill her mother's goals. Hen reaches out to her wife to try to make amends, while Bobby and Athena go on a first date.

New firefighter Eddie Diaz (Ryan Guzman) joins the 118, quickly becoming the object of Buck's attention. Buck's estranged sister Maddie (Jennifer Love Hewitt) moves to L.A. and admits she has left her abusive husband. Emergencies include a tour bus crashing in Hollywood, pressure cookers exploding in a restaurant, and a steam pipe explosion. Bobby and Athena have their first crisis as a couple, while the male firefighters of the 118 compete for a spot on a sexy calendar. Maddie begins her training as a 911 dispatcher and the episode cliffhanger sees an earthquake rock L.A., setting in motion events for the next two episodes. M.C. Gainey and Debra Christofferson guest star.

After a 7.1 magnitude earthquake rocks Los Angeles, the first responders must put their lives on the line and make some of the hardest decisions of their professional careers when they rush to rescue victims from a crumbling high-rise hotel both under the rubble and high above the ground. Meanwhile, Athena must deal with wreckage from a collapsed freeway overpass and Maddie is thrown into the fire as she faces a crisis on her first day as a 911 dispatcher.

The first responders continue to deal with the fallout of the earthquake and its deadly aftershocks. Meanwhile, Athena tries to keep the peace and Bobby and his team must help save one of their own while also continuing to rescue victims from the high-rise hotel. Maddie's "baptism by fire" continues as she telephonically helps a pregnant couple deliver their baby safely.

The first responders deal with a security guard stuck in between two buildings for several hours, a man trapped in a mall escalator, and a drunken girl whose head gets stuck in an oversized tailpipe. Meanwhile, Athena contemplates a lieutenant promotion, Buck gets involved in Eddie's personal life and learns that he needs help with his son Christopher (Gavin McHugh), who has cerebral palsy, Chimney goes for a check-up following his accident and gets a blast from the past, and Maddie reveals to Buck that she decided to move out.

Maddie goes on a ride-along with Athena, but soon finds her training as a nurse is required when they find a chef who has been the victim of a shooting, who tells them that 9-1-1 hung up on him. She is also aided by a seemingly perfect dispatcher, Gloria (Christine Estabrook). However, Gloria is revealed to be the same dispatcher who hung up on the chef when he was shot; they soon discover Gloria has hung up on hundreds of similar emergency calls, and she is promptly fired and arrested. The 118 are forced to put their disgust aside when a racist protesting a military funeral collapses, but refuses care from Chimney, Hen, and Eddie, while a porch pirate they once dealt with gets a serious dose of karma as she moves up to insurance fraud. Meanwhile, Hen must figure out how to save her family from permanently falling apart after Eva (Abby Brammell) shows up with Denny's biological father. When she finds Eva in a life-or-death situation, Hen chooses to save her.

When the first responders race to the rescue of a crashed news copter, they unwittingly become the subject of an eager reporter (Megan West)'s first on-air assignment. Whilst being tailed by the camera crew, the team responds to emergencies at an eating contest, a bodybuilding competition, and a toddler pageant, but find some of their members flying high after they ingest LSD-laced fudge. Meanwhile, Bobby tries to deal with his grief/guilt on the anniversary of his daughter's death, Athena prepares for May's homecoming dance, and Maddie struggles to let go of her fear of the past. Susan Ruttan guest stars.

On Halloween, the first responders race to the rescue at a cemetery, a haunted hayride, and a spooky Hollywood parade. Meanwhile, Hen receives news that her father, who abandoned her at age 9, is dying in hospital and has to make the decision whether or not to pull the plug. Eddie reconnects with his estranged wife (Devin Kelley) and Buck makes a decision on whether or not to keep waiting for Abby to come back.

The first responders deal with emergencies involving a woman who goes to great extremes on top of a freeway overpass (Romy Rosemont) to get the attention of her husband (Daniel Roebuck), a couple who are involved in a car accident on their wedding day, and a date that involves armed robbery. Meanwhile, Buck jumps back into the dating scene and gets curious as he notices Chimney and Maddie getting closer, and bonds with an elderly man (Francis Xavier McCarthy) whose husband (Lawrence Pressman) has been crushed between the gate of their home and their car.

This episode takes place in 2008, when Hen quits her job as a pharmaceutical rep. While having a conversation with her life coach (Rae Dawn Chong), the coach has a heart attack and Hen saves her by performing CPR. Realizing being a paramedic might be her calling, she applies to the LAFD. After training she is assigned to Firehouse 118, but immediately belittled by her bigoted captain, Vincent Gerrard (Brian Thompson). Hen stands up for herself in front of the entire crew and, after she saves the life of a young boy against the wishes of Captain Gerrard, discovers her team has made several complaints about him; Gerrard is subsequently fired. She meets Chimney there, begins a friendship with Athena, and gets a recognition from her teammates Tommy (Lou Ferrigno Jr.) and Sal.

It's Christmas time in Los Angeles and the first responders deal with a series of holiday-related emergencies. Meanwhile, Bobby gets cold feet when Athena asks him to move in with her, but then stuns Athena himself when he makes a massive decision about their future. Eddie struggles with whether or not to allow his estranged wife (Devin Kelley) to reunite with his son and asks Buck for advice. Buck experiences a moment of confusion after a woman misunderstands the nature of his relationship with Eddie. While trying to lift Maddie's spirit of the holidays, Chimney meets a man named Jason Bailey (Brian Hallisay).

The first responders deal with a traffic collision involving a truck returning a tiger shark to the wild and a gas leak at a plastic surgeon's office in the middle of a procedure. Bobby meets Athena's parents and Athena confronts her mom (Beverly Todd) after a cruel comment about Bobby. Athena and Maddie's intuition is praised when claims of a mistaken 911 call uncover a double kidnapping. Maddie attempts to move her relationship with Chimney forward by filing for divorce from her abusive husband Doug only to discover that he has left the city. Jason is revealed to be Doug and viciously stabs Chimney before abducting Maddie.

Following his stabbing at the hands of Maddie's husband Doug, Chimney's mind is cast back to 2005 when he joined the LAFD. As he wallows in being a failed entrepreneur, a drunken colleague at the bar he's working in starts a fire and Chimney's heroics save everyone. Chimney and his best friend Kevin decide to apply for the LAFD but, while Kevin is full of stories and excited about life with the 133, Chimney is the victim of Captain Gerrard's racial prejudices and becomes a glorified maid for the 118. After weeks of cleaning and biting his tongue, a paramedic called Eli takes pity on him and brings him onboard the ambulance. However, when Gerrard asks him to assist in a 5-alarm fire at an apartment complex, he is reunited with Kevin before the latter sacrifices himself to rescue a pregnant woman from the middle of the burning rooftop. On one of his first calls back on the job after Kevin's death and funeral, Chimney saves the life of fellow firefighter Tommy (Lou Ferrigno Jr.) during a methane leak, earning him the respect of the 118. The episode concludes in present day with Chimney bleeding out.

Buck discovers an unconscious and bleeding Chimney outside Maddie's home. As the medics arrive, Chimney is able to say, "He took her," and Buck realizes that Maddie has been kidnapped by her abusive husband Doug. Buck jeopardizes the case by illegally opening Chimney's phone, but then teams up with an off-duty Athena to track down Maddie. Meanwhile, Maddie does everything in her power to survive her kidnapping. At a rest stop, Maddie attempts to flee, but Doug catches her and kills the storeowner who tries to rescue her. Maddie leaves behind a clue which Athena and Buck find. Maddie manages to convince Doug to drive to a cabin in the woods, where Maddie manages to flee after striking Doug with a poker. Doug gives chase, but Maddie then decides to take a stand and fights Doug; although he stabs her, she gets hold of the knife and fatally stabs him in self-defense. Athena and Buck track Maddie to the cabin and find her. Maddie is overjoyed to hear Chimney is alive and they meet at the hospital, where Maddie kisses him.

Chaos ensues in Los Angeles when the entire 911 system goes down and everything has to be done manually. The firehouse is put on high alert when so many calls happen at once. Maddie returns to work and arranges a date with Chimney. While he is still unable to be at work, he contacts his old friend Tommy to assist them when an entire neighborhood blows up during a gas leak and the only hydrant is taken out by a crashing car. The 911 center also assists with a geriatric pregnancy in a building's lobby, but the system outage delays help arriving and puts the mother (Skye P. Marshall) at risk of dying. Maddie and the 911 tech guy make an FBI team look silly when they attend the call center after assuming it was hacked, while Bobby's fire safety talk leads to Harry (Marcanthonee Reis) doing something stupid and Michael (Rockmond Dunbar) unleashing his anger on Bobby.

The first responders deal with a possible nerve agent leak at a local bank and Hen is trapped when she tries to help the unconscious bank manager (Christian Clemenson) inside a locking bank vault. When Hen also passes out, experiencing the same symptoms, Bobby orders the team to break into the vault from the outside. The day takes a dramatic turn when stolen money from the bank is found inside one of the trucks and the entire 118 team is arrested on suspicion of robbing the bank - along with Athena, Maddie, and Michael. At the end of the episode, Bobby's chief is forced to suspend him due to a discovery made during the robbery investigation.

The episode begins in 2014; while living in Minnesota, Bobby is devastated when he accidentally starts a fire in his apartment block that kills 148 people, including his wife and two children. Consumed with grief, Bobby is suspended from the fire department after two years of heavy alcoholism and pain killer addiction and forced to enter rehab when his own team has to revive him after attempting suicide. After almost a year in rehab, he decides he wants to go back to work and transfers to Los Angeles to be the new fire Captain at Station 118 where he starts working with Chimney, Hen, Tommy and Sal. He also meets Athena during a call and end ups working with her to solve the case of a restaurant that burnt down. At the end of the episode, events return to modern day, where he is facing dismissal for not disclosing what happened in Minnesota.

Chimney is appointed interim captain after Bobby's suspension from the LAFD, but Bobby still remains the "go-to guy" for the 118 members. Things begin to get overwhelming for Chimney during a series of stressful calls, including a lottery winner trying to commit suicide, an explosion at a lawyer's home, and a reformed sugar addict fallen into a vat of molten chocolate. Meanwhile, Eddie's wife Shannon (Devin Kelley) announces that she wants to divorce but, in a tragic turn of events, is killed in a car crash. In the wake of Shannon's death, Bobby and Athena witness a news report about a second bomb attack. Meanwhile, Maddie gets a call from a girl whose brother is contemplating suicide; this leads Maddie to consider quitting as a 9-1-1 Operator, but she is brought into contact with people whose lives she's changed and decides to stay.

Athena and Bobby continue to investigate the serial mail bomber who is terrorizing Los Angeles, with a third incident claiming the life of a judge. Things take a dramatic turn when another package is left on Athena's doorstep, prompting the two to figure out that the bomber's motive is revenge on first responders. Later on, Stationhouse 118 becomes the latest target and the blast leaves many firefighters seriously injured, including Buck who gets pinned under the wreckage after the bomb detonates inside a moving firetruck. The bomber is revealed to be the teenager whose late father torched their family restaurant a few years earlier ("Bobby Begins Again"). Bobby puts himself in harm's way to stop him from carrying out a suicide bombing at the blast site and is hailed a hero before being reinstated as Captain. Buck is told in the aftermath of his ordeal that his leg injury is severe and he may have to consider a different job if he does not fully heal. Following his wife Shannon's death, Eddie's El Paso family tries to pressure him into moving back to Texas. Hen and Karen consider another adoption. The episode ends with Bobby and Athena getting married.

This episode is set 5 months after the Season 2 finale. Buck regains his firefighting certification following his accident. The celebration is cut short when Buck throws up blood and it is revealed that he has blood clots from pushing himself to get back to work. Later on, Bobby tells Buck that he is no longer cleared to be back at work and Buck angrily quits the LAFD. Meanwhile, Maddie and the team respond to a pregnant woman being kidnapped and the suspect taking her baby from her womb. The team also responds to an out-of-control teenage driver and an elderly man with a flesh-eating STD. Eddie goes to see Buck to cheer him up and asks him to look after Christopher while he is at work. The episode ends with Buck and Christopher enjoying a day at the Santa Monica Pier. However, Buck and the other piergoers soon realize a tsunami is heading straight for them.

Buck and Christopher fight for survival as a catastrophic tsunami hits the Santa Monica Pier. Buck helps Christopher climb on top of the abandoned fire truck belonging to Station 136 and they begin to help survivors escape from the rushing waters. Bobby and the rest of the team also begin to search the water for survivors. Meanwhile, Athena and her daughter May get into a car accident involving many others and are forced to rescue people when the first responders are unavailable. Also, Maddie tries to keep control of the 911 operation center and is left emotional when a caller drowns in his attic. The waves start to recede into the ocean, causing chaos. As Buck tries to help others reach the fire truck, Christopher falls over the side and is lost in the rushing floodwaters, causing a bruised Buck to jump into the water in an attempt to find him.

Buck continues to search for Christopher. Bobby, Eddie, and Lena of the 136 rescue survivors from a damaged Ferris wheel. Maddie enlists the help of a young girl who is an amateur drone pilot. Also, Athena deals with looters and is forced to amputate a firefighter's arm. Bobby, Chimney, and Hen rescue people from an apartment building, barely escaping before a gas truck explodes. Eddie saves a child and is reunited with Christopher at the triage site as a dehydrated Buck collapses. Eddie reassures Buck that he's still the person Eddie trusts most with Christopher.

During a fire drill at a high-rise, Buck is on "light duty" as a fire inspector. He is upset to discover Lena has taken his spot at the firehouse. At dinner with Bobby and Athena, Buck storms off after learning that Bobby is responsible for his backbenching. With Athena's encouragement, Hen and Karen decide to expand their family. At dinner with Chimney, Maddie has a flashback about Doug and rushes out in a panic. She secretly seeks out a distressed woman, who hangs up when her husband hears her. After seeing her arguing with her husband, Maddie almost runs him over with her car, then befriends her by hiring her as a personal trainer. Christopher tells Eddie that the "drowning woman" in his recurring tsunami nightmares is Shannon, his deceased mother. After consulting with a lawyer, Buck decides to sue the city, the department, and Bobby for wrongful termination.

During arbitration proceedings, Buck's lawyer throws the team under the bus. Buck is determined to get his job back and fights with the lawyer when he is informed that monetary reward is the only damage recoverable. Michael, May, and Harry experience a traumatic traffic stop with a patrolling officer and his subordinate, almost leading to Harry getting shot, prompting all except Harry to get outraged at the dangerous racial prejudice of cops. After reviewing the footage and the officer's rap-sheet of complaints, Athena decides to take matters into her own hands. Lena introduces Eddie to an underground fight ring after his arrest for assault over a parking dispute. He also confronts Buck about the lawsuit and how much that affected him and Christopher. The 118 also deals with young animal rights activists, a woman in a "rage room" with her husband's mistress, and a road rage incident in a parking lot. Bobby reinstates Buck back to the 118 due to the city's desire to settle the lawsuit. Hen and Karen learn that all six of Karen's fertilized eggs have genetic disorders.

Buck's heavily litigated and liability-waived conditional return to the 118 is dampened by an icy reception, especially from Bobby and a distanced Eddie. Buck and Eddie make amends at last, after learning Eddie's anger was due to Buck not considering how the lawsuit could affect their relationship. Bobby reinstates Buck as a full member of the team after Buck saves the lives of a man who crashed through the windshield of a woman's car and that of the woman who did not notice due to brain damage from the original crash. Athena responds to a house that is filled with malnourished children chained up in the basement after one of them manages to free herself and walk to the neighbors' door. The 118 responds to a call where two young boys are attacked by crows. A crow later follows Chimney around all day to return his lost, forgotten name tag. Maddie continues to befriend the woman with the abusive husband ("Triggers"). The woman eventually finds out that Maddie is stalking her and Maddie's supervisor orders that Maddie undergo a psychological evaluation before returning to work.

Athena receives shocking news that the gun used in her former fiancé Emmett's 28-year old murder cold case was recovered. She then makes it her mission to find the person responsible, much to the dismay of Bobby and her mother, as they think that she's too close to the case. The episode also shows flashbacks to 1989, when Athena first became a police officer after meeting Emmett at a job fair. At the end of the episode, Athena finds Emmett's killer with Maddie's help and, after he confesses his guilt, arrests him, bringing him to the station to be processed. Athena then has an emotional reunion with Emmett's mother, telling her that she has caught her son's killer. Athena then returns to her house and she and Bobby reconcile as she finally breaks down.

The first responders deal with a series of calls involving a serious accident at an ice skating rink that has severed the fingers of one man and left another man with a skate impaled in his chest, an out of control self-driving car, and a warehouse robot going rogue. Athena is suspended from the LAPD due to her actions from the previous episode. Maddie also remains suspended from the call center and tells Buck and Chimney that she is back in therapy. Meanwhile, Buck worries about Eddie's suspicious attitude. Eddie's fights at the underground ring get out of control when he nearly kills his opponent and he talks to Bobby about his emotions and all that's been going on since Shannon's death. Also, Hen struggles with her relationship with Karen following the loss of the embryos. The episode ends with Hen getting into an ambulance accident with a teenage girl named Evelyn, who dies from her injuries; Hen must face an investigation into the accident conducted by the LAFD and LAPD.

Bobby's career and life are put in jeopardy while at a call involving hazardous radioactive waste in the back of a crashed semi truck. Buck feels responsible for Eddie's fighting habits and they have an enlightening conversation while spending time with Christopher. Meanwhile, after being cleared from the fatal car accident, as it was caused by a malfunctioning traffic light, Hen continues to mourn the loss of Evelyn and contemplates not returning to the LAFD. Hen is later reunited with the life coach she saved who inspired her to become a paramedic when she goes to a resort with Karen ("Hen Begins") and she decides to return to work. Also, Maddie receives shocking news from the woman she was attempting to help ("Monsters").

It's Christmas time and the police and first responders deal with calls that involve a runaway airport luggage trolley, a woman whose skin turns blue after self-medicating, and a mall shopper pushed over the edge. A young boy calls 911 after his mom collapses, but fears he may have ended up doing more harm than good while performing the lifesaving procedure urged and directed by Maddie on the phone. Christopher isn't happy at learning he won't be spending Christmas with either Eddie or Buck, so later in the episode Buck manages to throw a christmas party at the station for all the families to be together. Meanwhile, after not remembering sleeping in the wrong bed and walking through a glass window, Michael reveals to Bobby that clinical tests determined he has a tumor; Maddie continues with her therapy and is forced to relive the day that she killed Doug ("Fight or Flight"); worried about Bobby being exposed to radiation, Buck and Athena secretly put together a Christmas dinner at the station to relieve stress for him.

The team responds to a series of calls involving an unconscious skydiving instructor dangling from an airplane, a bank mortgage representative getting run over by a tractor, and a man getting hit across the throat with a pipe. Meanwhile, Chimney receives a surprise visit from his half-brother from Korea whom he has never met; Athena and Michael tell their kids about the progress of Michael's brain cancer battle; Buck gets a clean bill of health from his doctor; Maddie gets to meet Chimney's adoptive parents for the first time.

Station 118 responds to calls involving a social influencer stunt gone wrong for the second time and a couple on a home date with the woman getting stuck in the bathroom window. Meanwhile, Athena and the LAPD investigate a woman who does not remember being shot in the back of the head. After getting injured while attempting to ride a skateboard thanks to a teacher's inattention, Eddie is forced to have a difficult conversation with Christopher as to what his limits are with cerebral palsy. Buck helps Eddie realize, with the example of baseball icon Jim Abbott that, with a little creativity, Christopher can overcome anything and they share a special family moment in the park. Josh, one of Maddie's supervisors at the call center, is severely assaulted and mugged while on a first date with a man from a dating app in a cemetery during an outdoor movie screening.

The team responds to calls of a woman's arm getting caught in a pin setter at a bowling alley and a man accidentally shooting himself in the chest with a nail gun. Meanwhile, Bobby and Michael take Harry on their annual camping trip, despite May's protests about Michael's health. Athena also talks to Hen about her fears regarding Michael's health. May is accepted into USC for college. Chimney's plans to take Maddie out to a romantic dinner to tell her his true feelings take a dramatic turn when another woman gets pinned in between the wall and a table of the revolving restaurant. The episode ends with Maddie, Josh, and the rest of the 911 call center being held hostage by fake cops led by the same men that assaulted Josh in the previous episode.

One of the thugs dressed as police officers holding Maddie, Josh, and the rest of the staff at the 911 call center prisoner turns out to be Greg, the same man that assaulted Josh. Their plan is to distract the entire police force in order to steal millions of dollars worth of paintings from a museum. After being tipped off from one of the 911 operators, Athena teams up with Chimney and Buck to help reach a conclusion to the situation. After all the perps have been arrested, it is then revealed that the driver, Tiffany, was the mastermind behind the heist, having hired Greg and his team in order to put the blame on them for revenge as their former driver, Tiffany's father, had been left behind on their last caper and died.

Stationhouse 118 responds to a situation involving a child stuck in a sewage pipe. Eddie volunteers to go down and rescue the child, but ends up putting his own life in danger and begins to experience memories from his past. In 2011, Eddie's girlfriend Shannon gives birth to their child Christopher in El Paso, Texas. Later on, their relationship becomes strained after Eddie announces that he plans to reenlist back in the Army. In 2015, Eddie and Shannon discover that Christopher has been diagnosed with cerebral palsy, putting more of a strain on their relationship and leading up to Shannon abandoning the two. In the present, the team tries to rescue him while comforting a devastated Buck, who begins to fear the worst and can't seem to think straight. Although Eddie nearly dies, the team manages to successfully rescue him.

After treating a couple trapped in an apartment fire, Hen learns that the husband died from cardiac arrest in the hospital, prompting Hen to question her judgement in the doctors' course of treatment. Later, she saves the life of another man, who accidentally shot himself in the chest with a whipped-cream charger during a TV cooking show, by pinching his aorta in the ambulance. Meanwhile, when every other member of Station 118 has plans after shift, Buck meets a retired firefighter at a bar and decides to help him achieve his goals. Also, while responding to an accident involving a drone, Athena discovers that the drone's owner, who was later released from custody, is actually a serial rapist after footage is found in his garage.

The 118 responds to a call in which a child is trapped in a runaway hot air balloon. Maddie also receives a call from a man trapped inside of a walk-in freezer due to a power outage caused by a woman who stole a tree trimmer truck. Meanwhile, Athena continues her investigation into the serial rapist. She tracks him to a storage facility, where he brutally attacks her as Maddie and the 118 listen to the attack over Athena's radio in horror, although Athena is able to subdue him and stall him long enough for Bobby to arrive. Karen begins to suspect that Hen is cheating on her after finding a suspicious phone number and lying to her about it, while Hen secretly considers going to medical school. Also, Josh asks Maddie for advice when he receives a call about appearing in court to attend Greg's sentencing. The episode ends with a train derailment and former 911 telephone operator Abby Clark calling in the accident.

The 118 rush to save lives in the aftermath of a massive train derailment. Surprisingly, former 911 operator Abby is among those who were on the train and she informs Buck that she has moved on from their relationship and started a new one. The encounter with her leaves Buck in shock and Eddie with mixed feelings about her return to Buck's life. Athena deals with the aftermath of her assault, Maddie reveals some shocking news, Michael gets good news about his health, Buck finally gets closure from Abby regarding their previous relationship, and Hen has a tough choice to make.

The team struggles with their lives during the pandemic, with Athena returning to the LAPD despite Bobby's concerns and May working at the dispatch center under Maddie's supervision. Seismic activity occurring near Hollywood causes the Hollywood Reservoir Dam to break and the team responds to a bus crash and a cyclist trapped inside a sewer after being swallowed by the reservoir flood. The dispatch center senses that a landslide is possible in the Hollywood Hills. Athena is ordered on the field by Captain Maynard, where she responds to an agoraphobic woman named Sylvia who cannot leave her house. After seismic activity is sensed in the hills, Athena tries to get the woman to leave with her to safety, but she steps back into the house; Athena follows her while the house, alongside the Hollywood sign, falls.

A group of hikers witness the Hollywood Sign crashing down, forcing the 118 to go into action while Athena and Sylvia fight for their lives inside her unstable home after a shift in the ground leaves Sylvia pinned. While rescuing a baby from a buried home, Chimney discovers a group of pregnant women being held prisoner inside a buried house, but one of them unexpectedly goes into labor, forcing Chimney to make sure the baby is delivered safely. After being able to reach Athena, May tries to convince her to leave Sylvia behind, but Athena refuses and successfully rescues her, allowing the two to escape. After witnessing Bobby fly by, she alerts him by using her patrol car's emergency flashing lights, giving May a sense of relief. After Athena confronts May about her job, May reveals she took it after witnessing Athena's injuries.

The team at the 118 deals with a series of calls including a man living in a smart home slipping in the shower and hitting his head. Maddie suspects that the 911 caller might be an electronic peeping tom. Hen's first day in medical school goes badly when one of her fellow students begins to give her a hard time because of her age. After learning that Buck is seeing a therapist, Maddie contemplates telling him a secret from his past. Using a phone app, Athena tracks down a bank robber disguised in COVID-19 protocol gear. After the previously-mentioned "smart home" latches onto a remark of Eddie's, Buck and Christopher team up to prank him. The episode ends with Hen, Eddie, and Buck traveling to Texas to help fellow firefighters in an out-of-control wildfire, setting up their appearance in the 9-1-1: Lone Star episode "Hold the Line".

During a neighborhood block party, a woman (Lisa Ann Walter) who intimidates the neighborhood calls 9-1-1 to report pests, but unexpectedly is found dead when May overhears a gunshot in the background. Athena is sent to investigate. Maddie and Buck's parents (Dee Wallace, Gregory Harrison) arrive in town to meet Chimney and cause growing tension. The team is called into action after May oversees a call where a man reports a bomb threat. Buck receives support from Eddie after opening up to him about his relationship with his parents. The episode ends with Maddie revealing a painful family secret: that she and Buck had a deceased brother named Daniel.

In 1996, Maddie teaches Buck how to ride a bike (revealed to have been belonged to Daniel), but he falls off and is confronted by their parents. In 2004, Maddie reveals that she and her boyfriend are moving to Boston for medical school. In 2012, Buck begins his downward spiral with skipping college and getting into car accidents. After being confronted by his parents, Buck asks Maddie to leave with him, but she declines and gives Buck her car. Between 2012 and 2016, Buck travels around the country, working different jobs and eventually ending up in Los Angeles. He graduates from the fire academy and joins the 118. In the present day, Maddie reveals to Buck that they had a brother that died of leukemia and their parents had Buck to use him for bone marrow, as they and Maddie were not matches. Also, the team responds to a large fire and Buck searches for a victim and rescues him. After a heated confrontation, Buck and Maddie finally reconcile with their parents.

The team at the 118 deal with a mountain of bizarre calls after a new recruit (Anirudh Pisharody) "jinxes" the house by using the forbidden word "quiet". A series of calls involve a man duct-taped to a billboard as a publicity stunt, a restaurant manager throwing chairs out of his windows because of a reported gas leak, and a garage on fire with thousands of dollars worth of fireworks inside. Eddie meets Christopher's ex-teacher Ana Flores (Gabrielle Walsh) at an accident scene. Athena pursues a man who has stolen the 118 fire engine.

The team at 118 deal with calls involving a man pinned down by a military truck that fell from a cargo plane and a mysterious gas that made the victims' eyes bleed. Meanwhile, Michael asks for Bobby and Athena's help when he thinks one of his neighbors across the street might be running an illegal surgery ring. Hen is shocked to discover that her mother (Marsha Warfield) came to visit unannounced and revealed that she is moving to Los Angeles. Also, Buck learns that a woman that he had a bad date with lives in the same apartment building and does everything in his power to avoid her.

The team responds to a series of calls including a flight attendant jumping out of a parked airplane and a hostage negotiation lasting six hours. Athena deals with a domestic disturbance when a woman tries to kill her husband and hide him in the wall. Meanwhile, Maddie and Chimney discuss having a home birth when COVID-19 protocols get in the way of having a traditional birth. Christopher has a negative reaction upon learning that Eddie is dating and later runs to Buck, who reassures him he'll always be there for him. Also, Buck deals with the fallout of his roommate, Albert, going out with his previous date.

The police and first responders are put on full alert after receiving a call of a multi-car pileup. This call hits close to home for Bobby, as the cause was a woman drinking and driving the wrong way on the highway as her child in the backseat makes the 911 call. Meanwhile, Maddie goes into labor at the same time Chimney's brother Albert (John Harlan Kim) gets caught in a roll-over accident related to the pile-up. Also, Hen and Karen are on opposite sides when it comes to giving up their foster child because the child's mother wants to reunite with her.

The team responds to a call at a children's birthday party where a mother is accidentally pinned to a wall by trampoline springs. Meanwhile, Maddie and Chimney adjust to life as new parents while at the same time taking care of Albert following his car accident. Athena and Michael are worried for May when she re-friends the girl whose bullying and humiliation of her drove her to attempt suicide. Bobby and Athena discuss the situation regarding May being at the 911 call center and her previous suicide attempt. Also, Hen and Karen struggle to cope with change after being forced to give up their foster child. Later on, May listens to the 911 call made by her mother the day she overdosed. May gets emotionally affected and cries when she realizes that her mother thought she was not breathing and was nearly dead.

911 dispatch supervisor Sue Blevins (Debra Christofferson) is the victim of a hit-and-run. Her deputy Josh (Bryan Safi) has trouble keeping the call center in order and reminisces about a fire, which Sue helped him escape, when he was freelancing in an office tower for the day back in 2006. When Athena's investigation uncovers that Sue's hit-and-run is related to the kidnapping of 21-year-old Tracie Webber, Athena, the 118, and other officers team up to track down a possible suspect. Josh is able to guide them in a chase through a maze of shipping containers. They successfully arrest the suspect and rescue the kidnapped Tracie. The episode ends with Sue finally returning to the 911 call center and cheering everyone up.

The city of Los Angeles and the first responders are put into a chaotic situation when a famed author dies and leaves a chest of treasure worth $5 million buried somewhere in Los Angeles, causing the 118 team to break up into various teams to find it. Athena is shocked to discover that the author (Patrick Fischler) faked his death to figure out the ending of his latest book, but is even more shocked when the author later turns up actually dead. Eddie and Buck team up with Taylor Kelly to find the treasure, despite Eddie's dislike of Buck and Taylor's new friendship.

The team responds to a call when a mother has fallen through her apartment balcony. Later on, Eddie suspects that she is deliberately making her child sick for insurance and money donated via social media. Meanwhile, Athena and Bobby have marital problems when Bobby keeps a secret from Athena. Maddie experiences post-partum depression following the birth of her child. Hen grows concerned for her mother's health. Eddie starts questioning his relationship with Christopher's former teacher when Carla points out he may not be following his own heart. The episode ends with Eddie getting shot in the shoulder by a sniper in front of a shocked Buck, leaving his life hanging in the balance.

The first responders run for cover after a professional sniper begins targeting firefighters, with Eddie fighting for his life in the hospital. Following the shooting, Buck takes care of Christopher while dealing with his own pain over almost losing Eddie. A post-partum-depressed Maddie asks for Chimney's help after she quits her job without thinking. Bobby and Athena reconcile following their argument. Hen and Karen meet the mother of their former foster child. Eddie confesses to Buck he would be Christopher's legal guardian if anything should happen to him. Buck takes Eddie home to a surprise party. The episode ends with Chimney's half-brother Albert finishing his LAFD training.

A group of hackers use ransomware to take over all of L.A.'s technology. The 118 is called when a woman's hacked GPS sends her straight into a river. A scare at an airport control center leads to three operators having heart attacks simultaneously. Athena's suspect Jeffery Hudson (Noah Bean) goes on trial, but escapes when the ransomware attack occurs. Eddie experiences a panic attack after a salesman mistakes Ana for Christopher's mom. A worried Buck discovers Eddie's health scare. Maddie's post-partum depression worsens. The attack causes a citywide blackout, leading to the 118 helping out at a short-staffed hospital. Jeffery's attorney (Carly Nykanen) is revealed to be in love with him when she slits Detective Lou Ransone's (Sasha Roiz) throat.

The 118 springs into action when the hospital's helicopter crashes due to the blackout and animals from the L.A. Zoo escape. The blackout coincides with a major heatwave and Michael and Harry open up Athena and Bobby's house to hot and thirsty neighbors. Chimney confides in Hen about Maddie's condition. A 12-year-old boy's ventilator runs out of battery and his neighbors, with May's help, band together to recharge and restart it. Eddie starts realizing his panic attacks might be related to his relationship with Christopher's former teacher and opens up to Buck about it. Buck encourages Eddie to follow his heart and break up with her. Jeffery Hudson escapes again after killing his attorney and kidnaps Harry (Marcanthonee Jon Reis) as vengeance against Athena.

Athena and Michael frantically search for Harry as the blackout continues. The 118 is called to an accidental shooting in an enclave formed of people who hate any kind of official personnel. Jeffery Hudson is also hiding there. Athena goes undercover to look for him with the 118's help, during which she kills Jeffery and saves Harry. The blackout ends with the hackers going offline before their identity can be determined. Eddie breaks up with Ana after admitting he was trying to make the relationship work for Christopher, even though his heart was not in it. The episode ends with Maddie visiting the firehouse with the baby, leaving Chimney a video message detailing her personal problems and telling him that she is leaving alone.

The 118 jumps in when a truck crashes into a high school homecoming parade. Eddie and Hen confuse two cheerleader victims, one of whom was killed and the other injured. Athena and Michael try to help Harry in the aftermath of his kidnapping, but it ends up stressing them out as well. May is intimidated by returning call center legend Claudette (Vanessa Estelle Williams), who denigrates her due to her lack of experience. Chimney obsesses over trying to figure out what led Maddie to leave and finds out Buck knew all along. Buck tells Chimney not to worry, but Chimney angrily punches Buck. Buck opens up to Eddie about wanting to do what's best for his sister and Eddie helps him understand both Maddie's and Chimney's points of view. Chimney decides to go find Maddie.

The 118 is called in when a man overdoes exercising and a groundskeeper is injured by his own chainsaw. May talks to Athena about Claudette, but refuses any help. Bobby is called when Harry gets suspended from school for fighting and exhibiting a bad attitude, a result of misinterpreting advice May gave him. Bobby demands Harry open up to his parents about his problems, but Harry runs away to May's apartment instead. When Athena and Michael track him down, Harry angrily blames them for the kidnapping, causing Athena to unnecessarily slap him. A meth lab in a retirement home explodes due to a faulty chandelier. May receives brief praise from Claudette due to saving a suicidal teenager, but the putdowns continue. Michael upsets Athena when he refers her to a therapist without consulting her, remembering their mutual promise to never hit their kids. Buck's stress over not hearing from Chimney or Maddie mounts and he takes out his anger by bossing around a new recruit. Buck finally gets a call from Maddie, which inadvertently gives him a clue as to her whereabouts.

The 118 is on their guard when they respond to a fire started by a prison riot. Two inmates escape and take Buck, Eddie, and an injured guard hostage in the 118's ambulance while the rest of the team are trapped in the prison infirmary with the prison doctor and another injured guard. Buck is attacked by one of the inmates after reacting when they threaten to go after Christopher. Athena discovers the motive for the escape was so one of the hostage-takers (Mark Pellegrino) could see his son, who is dying from heart disease. The prisoner wants to be killed so that his heart can be used. Athena manages to save Buck and capture the other escapee. Buck worries about Eddie, since he's left trapped with the other inmate. Eddie manages to talk the desperate father into turning himself in, promising to find his son another donor so both can live, but the convict commits suicide after releasing Eddie. Even though it's against protocol (and possibly the law), Athena manages to arrange for the convict's heart to be used for the transplant, saving his son's life. Meanwhile, Hen decides to go into general surgery.

May gets a call from a man (Philip Anthony-Rodriguez) who claims he was carjacked, shot, and buried alive. The 118 rescues him, but are puzzled by his ordeal. Detective Lou Ransone (Sasha Roiz) returns to duty and investigates the suspicious burial. Meanwhile, Chimney continues his search for Maddie, during which he arrives in Boston and saves a baby boy who goes into cardiac arrest in a parking garage. Eva (Abby Brammell) pays Hen an unexpected visit and tells her she is leaving California and moving to Oregon to make a fresh start. Harry struggles with his trauma, which eventually leads him to visit the place where Jeffrey took him. While there, he falls through the floor and calls Athena for help. After talking with detective Ransone, Harry decides to return home.

After witnessing the aftermath of the storm in Haiti, David decides to go use his medical skills to help the people in need. Michael, who cannot think of life without David even for a while, decides to propose, but his plans are interrupted when an explosion occurs at the hospital where David is doing surgery. Claudette takes the call of a young boy trapped during the explosion. However, she is devastated when the call fails and Buck confirms the room was lost to the fire; however, it is revealed the boy misread the room number and he is still alive. Despite a successful rescue, Claudette feels overwhelmed by the call. David is reunited with Michael and he accepts the proposal. After the fire, Michael reveals he will be going with David to Haiti.

The 118 puts their skills to the test when a student driver's car gets stuck in a sinkhole caused by an exploding oil well and the instructor is stabbed in the chest by her own pen. A man shocks himself while jumpstarting his car and, when the 118 responds, it is revealed that he knew Hen's mother in 1974. Taylor goes to Oklahoma to see her father, who was jailed for murdering his wife and now eligible for parole. She tells Buck she does not want him to come, but he surprises her there. Athena investigates when a Santa Claus volunteer tries to cash in a donated casino chip for the charity he's helping at that turns out to have been part of the loot in a robbery from that same casino in 1987. Hen gives Toni the courage she needs to reconnect with her former flame.

The episode starts in a Christmas village attraction where a woman learns that her husband is also married to another woman. The man tries to run away, but is hit by a trolley, needing the 118 crew to step in. A woman gains the courage to ask her co-worker out on a date; however, when he reacts unexpectedly, she backs away and into an open elevator shaft. Eddie notices Christopher stressing out over the need to make Christmas perfect. Part of a housing complex collapses on a car, trapping the man inside. Due to instability, his family and all the other residents are left without their homes for Christmas. Bobby and Athena set up a Christmas celebration on the lawn outside the motel for all the families. After a talk with Bobby, Eddie tells Buck and Hen that he is leaving the 118 due to Christopher's fear that he could lose his dad.

With their new temp paramedic Jonah, the 118 jumps in when a quinceañera stunt leads to the discovery of a paraglider who crashed into a garage roof. Eddie starts working at the 911 dispatch center, but struggles to settle in. In a parody of the movie Speed, a family's truck is rigged with a bomb that will explode if the car slows below 55 mph. Eddie overhears the 911 call and takes over to warn Bobby of a likely secondary sensor on the bomb. After, Josh congratulates Eddie for his quick thinking, but tells him to never again hijack calls. Eddie goes to meet the 118, who are celebrating in a bar, but sees how happy everyone looks without him and quickly leaves. Buck strikes up a conversation with Lucy (Arielle Kebbel), a firefighter who assisted in the bomb rescue; they end up kissing. However, Buck can't bring himself to tell Taylor and instead asks her to move in. Christopher tells his father he never wanted him to quit. Eddie asks to return to the 118, but Bobby does not feel Eddie is ready to return, angering him. Athena is called to a dispute where a man's habit of collecting junk results in him constantly fighting with his neighbors. Upon learning that the pickup truck family from earlier lives across the street, Athena realizes that the man is the bomber and apprehends him. The episode ends with both Jonah and Lucy joining the 118, to Hen's chagrin and Buck's horror, respectively.

Maddie returns to the series, first shown attempting to drown herself after dropping Jee-Yun at the 118 firehouse, but reconsidering after thinking about Chimney and their daughter. Maddie gets therapy in Boston and begins making progress, then starts helping another woman in rehab who is a struggling alcoholic. Chimney manages to track Maddie to Boston but cannot locate her, so takes a job as a volunteer paramedic. His first day happens to be St. Patrick's Day and he responds to a bagpipe player who collapses during a bar brawl. Chimney and Maddie reunite when the woman Maddie is trying to help relapses with alcohol poisoning and they save her life together. Maddie visits her daughter at Chimney's temporary apartment and later decides she is ready to come home.

Chimney and Maddie return to Los Angeles and reveal they have broken up. The 118 responds to a novice diver who resurfaces too quickly after panicking in a shark cage and a man entangled in a web spun by the tarantulas he was pet-sitting. Eddie has a therapy session, but does not manage to open up. Maddie and Buck talk about Buck's fear of being left behind and he recognizes he might be settling for Taylor. Buck confesses to Taylor about kissing Lucy and Taylor realizes that's why he asked her to move in with him. Because of a medical condition, a woman loses her ability to feel fear, causing her to douse a man with gasoline after he attempts to rob her and almost jump off a recycling plant tower. Taylor and Buck make up, promising not to keep any more secrets. Eddie relives a bad moment in his army career which causes him to go into a rage, scaring Christopher, who calls Buck for help. Buck rushes to the house and calms Eddie down, after which Eddie finally opens up about his trauma.

Shortly after Chimney rejoins the team, the 118 has a wild day when they respond to a woman who fell off a penthouse balcony and a man stuck in a clothing donation box. Maddie considers returning to the call center. Athena pursues a pair of pranksters stealing road signs after one of their signs flies out of their truck and impales a cyclist, then ends up coming to the rescue when one of them is hit by a car. Buck takes care of Chris and Eddie while the latter continues his therapy. He finds the boy Eddie saved from his abusive mother right before being shot ("Suspicion") and shows Eddie how much the boy's life has improved because of him.

The 118 has a hectic day when a college student living a double life as a media influencer cannot be located after falling in a sauna, and a reality TV wedding turns chaotic after the groom collapses. May's USC deferral is about to end; she must either start college or lose her spot. Karen starts feeling her age when she compares herself to her much younger colleagues and responds by taking Hen to unique places and exhibits until her purse is stolen. The 118 responds to a woman who fell into an old underground military fortress while hiking with her daughters. The woman refuses to be transported until she speaks to her kids one last time, as she is already dying from her wounds; she succumbs to her injuries after doing so. Maddie continues to feel like a bad mother after missing so many milestones in Jee-Yun's life while in Boston. Hen and Karen track down the purse thief at a nightclub after Hen's credit card (which was in Karen's purse) is used, giving Karen the excitement she was after. The episode ends with Chimney and Maddie happily witnessing Jee-Yun feeding herself for the first time.

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May reaches her breaking point with Claudette and yells at her in front of the other dispatchers, leading Sue to put them both in the "quiet room" to work things out. Albert tells Chimney he no longer wants to be a firefighter. The call center is set on fire and May and Claudette are left behind in the panic. Eddie teams up with Buck and Chimney with Albert. When Bobby learns May is still inside, he rushes in to save her. Claudette mysteriously starts losing hope and condemning herself and May to their fate, but it is revealed she is afraid of fire after May finds burn scars on her shoulder. Buck and Eddie manage to save an electrician and Bobby finds May and Claudette just in time. Just after Claudette is taken out of the building, Albert, who is on the roof with Chimney, falls through, causing the ceiling to collapse on May and Bobby. Both survive and, after they are taken outside, Claudette finally accepts May as a teammate. Eddie realizes being a firefighter is his calling. Chimney accepts Albert's decision to quit. The episode ends with Claudette suddenly dying upon arriving at the hospital, causing Hen to become suspicious of Jonah, who was administering first aid in the ambulance.

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The episode begins with a flashback to a 13-year-old Jonah hailed as a hero for saving a school bus driver who had a heart attack behind the wheel. In the present, following Claudette's death, Hen relates her suspicions about Jonah to Chimney, recalling how the pet-sitter who was attacked by spiders also coded suddenly while Jonah was tending to him. Chimney believes Hen and the two investigate Jonah's past. Upon learning of his childhood heroics and several others who mysteriously died on Jonah's watch, Hen is convinced Jonah is playing God as a way of regaining the attention he got for saving the bus driver. She relates this to Bobby and Athena, the latter cautioning her to be careful. Bobby reports Hen's suspicions to the chief and Claudette's death is put under investigation, but Jonah discovers that Hen reported him and kidnaps both her and Chimney. Hen confronts Jonah and he replies that everyone needs to know he is not just a one-time hero. Chimney breaks free and subdues Jonah, who is arrested and beaten up by Bobby for betraying the team. Taylor runs the story about Jonah after promising Buck she would not, breaking his trust in the process and causing a permanent rift between them. Meanwhile, Eddie travels to his hometown in Texas for his estranged father Ramon's retirement party and the two end up reconciling after Eddie discovers his father hid his heart problems due to pride and recounts his own situation.

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The 118 rescues a wellness guru stuck on a cliff after his followers turn on him due to him putting drugs in their drinks. Chimney and Maddie get lunch together and Chimney assumes she is asking permission to date other people. Maddie corrects him, clarifying she was contemplating returning to work as a dispatcher. Meanwhile, the 118 tends to a hairdresser who passed out while redoing the hair implants of a lady who complained about pain. It is revealed she was infested with maggots in the back of her head, as the hairdresser was using the hair of the deceased. Clive and Toni reveal they are getting married but, when Toni asks for the ceremony to be hosted in their backyard, Karen storms out. After Hen talks to her, she remembers Toni did not attend their wedding. Buck realizes he isn't happy in his relationship with Taylor and breaks up with her after Eddie advises him to stop avoiding her. Eddie inquires about Bobby and May reveals a smashed cup incident. Eddie drives to Bobby's house and explains how much he means to him. Bobby throws away the alcohol he was planning to indulge in. After Karen and Toni talk, Karen gives Toni the green light to host the wedding in their backyard. However, Toni converts her wedding into a surprise vow renewal for Hen and Karen. At the vow renewal, Bobby surprises Athena with cruise tickets for the honeymoon they never had. The episode ends with Eddie coming back to the 118 and the whole team back together again.

The 118 rushes to the rescue when a blimp crashes into a crowded football stadium; during the panic, Athena saves a girl with an artificial heart. Maddie temporarily moves in with Chimney after her apartment develops a leaky roof and realizes she is still in love with him. Bobby tries to decide who will be interim captain while he's on his honeymoon. Buck explains to Eddie and Christopher why he does not want to get a new couch (Taylor took the one he had with her). Maddie confesses her feelings to Chimney. Athena and Bobby are on a video call with Athena's mother Beatrice when Athena's father Samuel crashes his car into the house.

Athena and Bobby must travel to Florida when Samuel suffers a stroke, and Athena's childhood friend Junior helps rebuild her parents' home. With Hen as the new interim captain, the 118 responds to a man who used explosives to kill a supposed gopher tunneling under his garden, but the revealed truth is stranger. Hen exhausts herself juggling work and med school, narrowly avoiding a car accident as a result. Beatrice is in denial over Samuel's condition and argues with peacemaker. Three elderly men and a young staff member at a happiness convention are crushed by falling rubble when the convention center collapses, with one of the men sacrificing himself to save the staff member. Bobby and Beatrice make up and she admits to Athena she fears losing Samuel. Police swarm the house after Bobby discovers the body of Tanya Kingston, whose disappearance 45 years ago first inspired Athena to become a cop ("Haunted").

In a flashback to 1977, a 9-year-old Athena wakes up to the alert that Tanya Kingston has gone missing. In the present, Samuel is being considered a suspect in Tanya’s death and Athena is reluctant to defend her father despite believing in his innocence. Athena and Bobby visit Tanya’s old home and are confronted by her older sister Joanne, who believes Samuel killed Tanya but soon admits she blames herself for what happened, as Tanya had followed her when she snuck out to a party the night she disappeared. Athena then learns that her childhood friend Junior was at that party and had ample opportunity to abduct Tanya. Bobby discovers that Junior has taken Joanne hostage and rescues her with Athena’s help while Junior is arrested. It's revealed that Junior killed Tanya after attempting to molest her, had killed five other girls for the same reason, and that his father Reggie was covering for him. Athena then receives the news that her father is awake and will recover, leaving her happier than ever.

The 118 save a man trapped under tree roots and, later, a dog who consumed drugs. Bobby comforts Hen over her struggles as captain. Buck agrees to be a sperm donor for his friend Conner. Eddie learns to give Christopher more independence. Chimney treats a drunk driver who drives off with him; Buck chases them on a bike. Hen gets a second chance at med school. Maddie gets help with a call from a girl in danger from her abusive father. Athena returns home after finding a caregiver for her father.

Athena investigates a suspicious string of robberies after two home invasion incidents occur at the same house within 24 hours, while the 118 responds to a DIY project gone wrong. Hen completes her medical practical and passes to now officially become a doctor after she spends one last moment with her colleagues at the 118. Bobby must find a new home for less-than-well-behaved rescue dog Hoover, who ends up temporarily fostered by every member of the 118; after dozens of failed placements, Bobby gives the dog to a woman whose husband was injured during one of the home invasions. It's revealed that Noah was an accomplice in the home invasions, having learned Maddie's password, using it to access information about unattended houses and attempting to frame her for causing them, and Athena is able to arrest Noah's accomplices.

On Take Your Child to Work Day, an explosion happens in the lab where Karen is taking Denny, forcing the 118 to go in. Backstory is shown of Hen and Karen's relationship from start to present and it's revealed that Chimney was responsible for setting up their first date. Karen nearly dies from a wound she sustained during the explosion, but Hen and the rest of the team save her. Hen ultimately decides to give up her dream of being a doctor and stays in the 118 to continue supporting Karen and Denny.

Felisa, a former B-grade film actress and current livestreamer, is crushed by a chandelier upon opening and putting on an antique bracelet. The 118 begin to believe that the bracelet carries a curse, as numerous incidents with Felisa occur while she is wearing it. Eventually, Athena catches the suspect, who is a counterfeiter trying to steal back the bracelet. After numerous delays (and a more-than-month-long term of abstinence), Buck is able to successfully complete his sperm donation.

The 118 investigates a series of calls that have to do with fantasies, including a teenager at a Renaissance-themed festival who gets several bees stuck in her knight suit, a man who fears he may have accidentally killed his bad boss after fantasizing about it, and a couple attempting to have sex on top of the 118's fire truck while it's en route (with the husband getting thrown off and sent to the hospital). May meets an old friend, Darius, and inadvertently learns that one of his roommates, Erik, may be planning a mass shooting. Erik threatens Darius' life but, with Athena's help, May is able to defuse the situation and Erik is arrested. Eddie wonders if Christopher has a crush following a conversation about a school party. Chimney and Maddie try to find a new house for them and a very active Jee-Yun, but are unsuccessful.

As the Santa Ana winds hit L.A., the 118 is thrust into a series of unexpected calls. A dog returns to its owner's house holding a severed hand, which is quickly revealed to be the result of several teens playing with fireworks. A reputed haunted house repeatedly calls Josh, forcing the police to investigate and Chimney to shut down the malfunctioning phone line. A woman, while sleepwalking, hotwires a car and drives into the fire station. Bobby is devastated to find that his friend and sponsor Wendall was killed in a car fire near a rehab center and suspects that the founders of the rehab center, Trey and Carrie Walsh, had something to do with it. Chimney and Maddie ultimately decide to buy the "haunted" house due to its cheap price from the false rumors. Buck receives word that Conner and his wife are expecting a child. Denny asks Hen about Eva and is later shown knocking on a man's door, saying he believes him to be his father.

A dry thunderstorm rolls over L.A., bringing in a series of lightning strike emergencies for the 118, including one where a man's kids prank him by burying him in sand, but the lightning strike causes the sand to turn into glass, damaging his throat. Athena and May go undercover at the rehab facility to help Bobby with his investigation into Wendall's mysterious death. Maddie dreads her parents' visit to her and Chimney's new yet unfinished house, while Chimney gets visited by Albert, their father, and his wife. Meanwhile, Denny is secretly talking to his biological father and taking baseball lessons from him. The episode ends with Buck getting struck by lightning while on a call, Eddie pulling him to safety, and the 118 taking him to the hospital.

As Buck's life hangs in the balance, he dreams of a world where his older brother Daniel never died. Though perfect at first, he finds that it means that Maddie never met Chimney and is still married to Doug, Eddie lost custody of Christopher, and Bobby died from alcohol poisoning. Buck thinks that, if he fixes things, he can come back to the real world. In the end, he finds that the only thing he needed to fix was himself after a talk with his conscience.

Bobby continues investigating the rehab center and learns from Tamara, a former patient, that Wendall was there trying to expose the criminal activities of the center's owners, the Walshes. The Walshes kidnap Tamara and force her to call Bobby; when he arrives, they burn down the center in an attempt to frame him. Luckily, Athena and Tamara provide evidence to the judge and the Walshes are arrested. Meanwhile, Buck feels overwhelmed by his family and friends' attempts to take care of him as he recovers from his near-death experience, so he goes to see Eddie for comfort and ends up falling asleep on his couch. Afterwards, the two open up about their respective traumas.

Maddie is visited by her overly friendly neighbor Carol; however, when Maddie visits the house Carol told her she was from, she is greeted by a person who tells her that "Carol" is an imposter. Maddie teams up with Bobby and Athena in order to solve the case and it is revealed that "Carol" is a coupon forger using Maddie and Chimney’s address to receive payments for her bogus coupons because she thinks the house is still abandoned. In addition, Hen discovers that Denny has been seeing his father Nathaniel after the latter two get into a car crash. Hen's mother Toni helps calm matters between Hen, Karen, and Nathaniel and they are able to work out a plan for Denny to bond with Nathaniel. Meanwhile, Buck temporarily gets enhanced math skills from being struck by lightning and Eddie takes him to a club where he wins several gambling matches. Emergencies featured include an instructor collapsing at a gym and a teenager allergic to water.

On the day of performance evaluations, Bobby sends Chimney to the academy as an instructor, ostensibly to work on the latter's leadership skills but, in reality, to convince Ravi to return to the 118. Meanwhile, Eddie's aunt pressures him to go on a date with a friend's niece, which goes poorly but ends amicably. Emergencies include a former bodybuilding champion popping a muscle implant at a bodybuilder competition, a woman getting her arm trapped in a mixing machine, and a teenager having a panic attack before his big audition.

Maddie and Chimney get audited by the IRS and learn they could save money on their taxes if they were married, causing Chimney to secretly begin looking for a ring to give her. A man Athena apprehended suffers a heart attack and seemingly dies in the hospital, but actually swaps himself with a dead patient; after Athena apprehends him again, he suffers an actual fatal heart attack. Emergencies in this episode include a man accidentally lighting himself on fire in an office building while trying to destroy tax records and a car crashing into the living funeral of a woman who has bone cancer. Eddie takes Christopher to visit Shannons grave. A death doula they met on a call shows interest in Buck. Later, Buck opens up to Eddie about how the lightning strike has made him question his own mortality.

Chimney struggles with his decision to propose to Maddie after buying a ring; however, he ends up losing it and, with Hen's help, unsuccessfully looks for it, running afoul of Athena in the search. Jee-Yun actually took the ring while Chimney wasn't looking and hid it in her dollhouse. Emergencies include two teens buried in trash while looking for a hard drive, a woman's son going missing, and a woman spitting out tonsil stones, mistaking them for teeth.

Maddie finds Chimney's ring and accidentally gets it stuck on her finger. After talking with Buck and Hen, Maddie decides to propose to Chimney and he accepts. Meanwhile, Eddie is not having good luck in love, but runs into Marisol, whom he and Buck had met in a previous emergency ("Home Invasion"). Buck starts dating Natalia, the death doula, but their dates keep getting interrupted when Natalia finds out about Buck being a sperm donor for his friends and then she runs away. Emergencies include a man's skydiving parachute getting caught and dragged by a robber's truck just as he's about to propose to his girlfriend, a woman's husband peacefully dying of cancer despite appearances, and an elderly bride accidentally falling through the rotted floor of her wedding carriage.

When a bridge collapses in the middle of an emergency, most of the 118 is incapacitated and it's up to Buck, Ravi, and Athena to save everyone. Buck and Ravi save Hen, Chimney, and Eddie while Athena, with the help of a man Bobby saved back in Season 2, saves Bobby. In the aftermath, Buck helps Connor's wife give birth, helping the couple to reconcile, and Natalia arrives to apologize to Buck, starting a relationship with him, while Eddie calls Marisol for a date. Maddie and Chimney discuss plans to get married, Hen and Karen decide to adopt another baby from an elderly grandma and Bobby and Athena finally go on their cruise together.

After a fighter jet crashes into the home of a bickering couple, Chimney falsely believes that his relationship with Maddie is "calcifying" and attempts to fix it; following an emergency where a woman's relational pressure gives her boyfriend severe hypotension, he realizes his misunderstanding. Eddie learns that Buck's relationship with Natalia has ended and, later, that Christopher misses his mom, prompting Eddie to give Christopher a letter that Shannon wrote for him when he was younger. Meanwhile, Bobby and Athena encounter Norman and Lola Peterson, a couple whose relationship they helped mend in Season 2 ("Buck, Actually"), on their cruise. When Lola goes missing and another woman with Norman is wearing Lola's ship ID, Athena suspects Norman of murdering her, but later learns that she was taken by a gang of pirates who think Norman possesses a dongle containing a fortune in Bitcoin on it. The pirates board the cruise ship and take everyone hostage.

Believing that he has the dongle, the pirate leader non-fatally shoots Norman. Its true owner, Julian, the ship’s activities director who has been having a long-term affair with Lola, surrenders the dongle to the pirates. The pirates leave, but not before detonating a bomb that cripples communications and the ship itself. Athena apprehends a fleeing Julian before she and Bobby go to the bilge room to try and keep the ship afloat. They become trapped and nearly drown before a reformed Julian saves them. The approaching hurricane capsizes the ship. Meanwhile, Hen worries she may lose her job following an emergency in which Councilwoman Olivia Ortiz's son, who emerged from a car crash seemingly unscathed and refused medical attention from Hen, dies from an unexpected brain bleed. Hen is eventually exonerated after it is revealed that the victim was both drunk and on drugs. Later, Hen notices that Bobby and Athena’s ship has vanished from radar and recruits the aid of Maddie to locate it.

On their way to the hole left by the bomb, Bobby and Athena’s group encounter a mother whose young son, Cory, was accidentally left in their cabin. Bobby goes to find Cory while Athena and the rest of the group proceed to the hole. Discovering that, while it is too high to reach, a flare can travel through it, Julian attempts to climb up and shoot a flare through the hole but trips, hits his head, and bleeds out. Athena manages to fire the flare successfully, alerting the 118, who had located the ship’s whereabouts and travelled there in an LAFD helicopter piloted by former 118 member Tommy. They rescue Athena’s group, then Bobby and Cory. Bobby and Athena are reunited, Norman is taken to the hospital, and Lola is arrested for aiding Julian.

Eddie and Tommy become good friends, exciting Buck's jealousy, and he injures Eddie during a basketball game. Maddie helps Buck realize his jealous behavior and when Tommy visits him, Buck confesses his feelings. Tommy kisses Buck and the two agree to go on a date. Harry Grant returns to Los Angeles, but the reunion joy is short-lived after it is revealed that he is wanted by the Miami-Dade police for assaulting a discriminatory bodega owner and fleeing the jurisdiction. Athena convinces Harry to surrender himself to the LAPD, and a deal is struck where Harry remains in L.A. for the time being while doing community service. Emergencies include the season premiere of The Bachelor being interrupted by a wannabe candidate superglueing herself to the driveway and a talking restaurant sink (which turns out to be a man trapped in the sewers below).

A motivational speaker develops alien hand syndrome and comically attacks the 118 when they arrive to help. Later, after Eddie and Marisol show up at the same restaurant, a nervous Buck flagrantly lies about the true nature of his date with Tommy, prompting Tommy to end the night early. Buck comes out to Maddie and Eddie, who help him understand his feelings. Over coffee, Buck reaffirms his feelings for Tommy and asks him to be his date to Maddie’s wedding. Meanwhile, Marisol moves in with Eddie and reveals to him that she was once a nun-in-training. This triggers a spiritual crisis in Eddie, who confides in Bobby (a practicing Catholic) and ultimately decides to move Marisol out while slowing their relationship. Hen and Karen foster the young Mara, who exhibits frightening and violent behavior. Hen struggles with this but, after a change of heart amid a call involving a rescue dog and its compassionate owner, later discovers that Mara’s behavior stems from trauma concerning her parents' fatal overdoses. Mara eventually finds comfort with the Wilsons. Some time later, Buck and Eddie arrive to Maddie and Chimney’s wedding in a disheveled state, but Chimney is nowhere to be found.

Chimney develops amnesia en route to his bachelor party (which Buck and Eddie enjoy wildly anyway), leading to him wandering the city in a disoriented state while re-visiting locations from his past. When he fails to show up to his wedding the next day, the 118 set out to locate him. They discover that Chimney is suffering from viral encephalitis, contracted weeks prior from a man he helped extricate from a heating duct, and later respond to a roadway excursion where Chimney was reportedly aiding casualties. Meanwhile, Chimney is haunted by apparitions of Doug Kendall, who taunts him to a point of near-death before he is saved by the image of his late foster brother Kevin Lee and eventually found by Kevin’s parents, who take him to the hospital. With Chimney’s memory restored, he and Maddie decide to hold their marriage ceremony in his hospital room. Soon after, Buck inadvertently comes out to the rest of the 118 after he shows up with his face dirtied from kissing a soot-covered Tommy.

Maddie receives a 9-1-1 call from a woman inside a travelling car who, alongside her baby, has been abducted by her husband. The car eventually crashes but only the woman is found when responders arrive. Sympathizing with the woman, Maddie visits her at the hospital and meets a nurse named Amir. The "husband", who is actually a stalker trying to replace his wife and child who left him, crashes into a police car while fleeing with a newly-kidnapped mother and is promptly apprehended by Athena and the 118. When Bobby returns the baby to her mother at the hospital, Amir recognizes him. Hen and Karen reunite Mara with her younger half-brother who was adopted by another family. Eddie encounters a woman, Kim, who is the spitting image of Shannon and begins an emotional affair with her.

Amir, who turns out to be a survivor of the devastating Minnesota apartment fire that Bobby caused during his drinking days, appears at Bobby's AA meeting. His talk compels Bobby to try and make amends. When Amir is attacked and wounded by a drug cartel during a relief movement in Jacumba, Bobby sets out to rescue him while grappling with painful boyhood memories of his father, a decorated firefighter whose own drinking and abusive behavior cost him his career, his family, and finally his life. After the two narrowly evade capture by the cartel and are rescued by the relief workers, Amir affirms that, while appreciative of his aid, he does not forgive Bobby.

The 118 and Tommy are gifted medals of valor for their roles in the cruise ship rescue. Bobby is also gifted one without his prior knowledge. He refuses to wear it and later tells Fire Chief Simpson that he plans on retiring. This is met with fierce opposition from Athena, who recruits Amir to help uplift him. Initially willing, Amir storms out after seeing how good of a life Bobby has built following the Minnesota fire. Meanwhile, Buck encounters Kim at the firehouse and confronts Eddie about it, prompting Eddie to confess to Kim about Shannon. Kim later shows up with her hair styled like Shannon’s and induces an outpouring of festered feelings from Eddie about his late wife. The two hug just as Christopher and Marisol enter. At the same time, in an act of revenge against Hen for her son’s death, Councilwoman Ortiz cancels Mara's adoption hearing; after Hen confronts her, she strips the Wilsons of their foster license and has Mara removed from their household. Later, after being taunted by his father in a dream, Bobby awakes to his house on fire. He saves Athena before suffering a heart attack.

Marisol leaves Eddie following the Kim incident while Christopher refuses to speak and has his grandparents move him to Texas for the indefinite future, having deemed the situation too unhealthy to be in. Athena confronts Amir, who she believes to be the perpetrator of the fire which destroyed her house and incapacitated Bobby, but they are interrupted by the cartel, out for revenge after Amir inadvertently killed one of their members in Jacumba. Alluding that they were responsible for the fire as Bobby had associated with him, Amir offers himself to the cartel peaceably. Athena later saves Amir from the factory that the cartel takes him to, helping him overcome his trauma when a fire breaks out. Maddie and Chimney foster Mara while Hen and Karen work on recuperating their license. Bobby recovers and, after a heart-to-heart with Amir, returns to the firehouse. There, the 118 are met with former captain Vincent Gerrard, who abruptly publicizes Bobby’s retirement plans before announcing that he himself will be taking over as captain, much to everyone's dismay.

Hen and Karen make progress with regaining their foster license; Hen notices that Chimney and Mara are growing close. Buck and Tommy help Eddie throw a birthday party for Christopher over video call, but Christopher is vacant and eventually leaves to celebrate with new friends, much to Eddie's dismay. Bobby is now a technical advisor for a firefighting TV show; he is undermined by production but idolized by the lead actor, Brad Torrence. A truck carrying 22 million killer bees crashes downtown, threatening the lives of a mother and daughter and, later, the attendees of a perfume party. Buck's initiative allows the 118 to handle both situations efficiently, but he is punished by Gerrard for unruliness. Buck later saves Gerrard from a flying circular saw but knocks him unconscious in the process. Meanwhile, Athena escorts her first fiancé's killer, Dennis Jenkins (“Athena Begins”), to L.A. so he can testify in a trafficking case in exchange for freedom. En route, she detains a fake officer who tries to take Dennis into his own custody; Dennis reveals that someone wants him dead. They passenger an L.A.-bound plane which, due to the bees obstructing visibility, violently collides with another plane.

Before the planes collide, Dennis tells Athena that he is being targeted because the perpetrator of the trafficking case, who was his cellmate, confided in him. The collision kills the pilots of both planes and creates two holes in Athena's — one in the cockpit that incapacitates the co-pilot, and another in the back of the fuselage. While Gerrard is taken to the hospital, the 118, via phone call, aids the plane's passengers in treating casualties. Athena attempts to fly the plane herself with the help of flight instructors on the ground and a young aviation enthusiast on-board. The co-pilot eventually awakens but suffers a heart attack shortly after. Meanwhile, all fire stations are directed to LAX; Buck travels there separately after retrieving Bobby (and Brad) from their show's set and taking a prop fire truck for transport.

Passengers on the plane take turns performing CPR on the co-pilot. The plane's rudder becomes damaged, removing its ability to turn. This eliminates LAX as a landing place; Athena instead aims for the 110 freeway, with Buck, Brad, and Bobby clearing part of it in preparation. The plane is successfully landed but a fire breaks out while the passengers are disembarking, threatening Athena, who stayed behind to continue CPR on the co-pilot. The fire stations arrive and the 118 and Bobby extinguish the fire and rescue Athena. Afterwards, Bobby deters a pair of detectives from locating Athena and Dennis, and the three go to LAX's long-term car park to retrieve a book detailing the trafficker's associates. A detective follows them, reveals himself to be a fake and shoots at Bobby; Dennis takes the bullet and stabs the detective, allowing for his detainment. Athena passes the book to trusted investigators and later has a heart-to-heart with Dennis, absolving herself of the resentment she held towards him over his past actions. Meanwhile, Gerrard returns to the 118 and is uncharacteristically beholden towards Buck, much to everyone's surprise and confusion.

Athena makes plans to rebuild her and Bobby's house. Gerrard prepares to lay off 12% of the firehouse due to budget issues; he later mandates all firefighters wear bodycams. Emergencies include a cheerleader with a twisted pelvis and a pet tiger attacking its owner and his landlord; Eddie, missing Christopher, confronts the cheerleader's absent father, helping repair their relationship. At her adoption hearing, Mara risks being returned to group housing after the Wilsons are revealed to have continued contact following her removal from their household. Councilwoman Olivia Ortiz, still bitter over her son's death, rebuffs Hen's pleas for mercy before revealing that she was the one who reassigned Gerrard to the 118. Hen and Bobby inform Gerrard of this, but Gerrard only urges Ortiz to shut down the 118 to solve the budget issues. The 118 fights against this in court, and Ortiz's reputation is ruined after it is revealed that Gerrard used his bodycam to record her schemes. Mara is reunited with the Wilsons and Bobby returns to the 118 as captain, with Gerrard taking on his technical advisor role.

A discontented Karen interrogates Hen on her continued absence during the holidays due to work. Athena lectures a classroom about Halloween road safety but is disrupted by dismissive students. Eddie laments over Christopher outgrowing Halloween. Buck unknowingly decorates the 118 Haunt Fest with a real corpse and terrifies a group of children by dislocating its left shoulder before dislocating his own during a subsequent call. Recuperating at home with Tommy, Buck learns that the corpse was once a boil-covered cowboy who was betrayed by his own posse. Buck awakes the next morning covered in boils, which, coupled with his injury, leads him to believe he has been cursed; Eddie and Tommy remain skeptical. On Halloween, Athena and the 118 deal with various inoffensive calls before responding to a car crash brought on by a man who car-chased the aforementioned students after they egged his home; the excursion kills the man and pins Denny against a house. Denny’s heart stops, but, thanks to a blood transfusion from Karen and CPR from Hen, he is revived and recovers at the hospital. Hen and Karen reconcile. Buck and Tommy visit the corpse’s grave, and Buck "lifts the curse" by giving a monologue about the importance of companionship.

Tommy offhandedly reveals to Buck that he was previously engaged to Abby Clark while he was still closeted; Maddie and Josh reassure Buck that his concerns over Tommy’s alleged insincerity are false. Eddie attends confession and professes his guilt concerning Christopher but rejects the priest’s suggestions of penance; he later runs into the priest in public, who discerns that Eddie’s newly-grown mustache is a disguise for his woes. Maddie suggests the prospect of a second child to Chimney, who is apprehensive due to the severity of Maddie’s prior post-partum depression. Emergencies include a deranged wife stealing her mother-in-law’s ashes, a cheating man sneezing his guts out, and a young boy who aids the rescue of his little brother from a hole in the ground. The latter emergency warms Chimney to Maddie’s suggestions; Maddie reveals that she is already pregnant. Buck discloses his past relationship with Abby to Tommy and asks Tommy to move in with him; Tommy, believing that he is only Buck’s “first” and not his “last”, ends their intensifying relationship to avoid heartbreak. Eddie shaves his mustache and dances around his home in a show of self-liberation. A dejected Buck arrives, and the two drink in contrasting silence.