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The everyday life of Arnold, a fourth-grader in the city of Hillwood, Washington, who lives in a multi-racial boarding house with his grandparents and a motley assortment of friends and neighbors.

Friendly dinosaurs climb aboard a train to visit different times throughout the prehistoric age, learning about dinosaurs and having fun adventures.

Picking up where Hey Arnold! (1996) left off, this tells the story of what happened to Arnold's parents.

Arnold and company must recover a stolen document needed in order to prevent the neighborhood from being bulldozed.

Jet Propulsion, an alien from another planet, and his pals Sean, Mindy, and Sydney learn about science.

Party Wagon is a cartoon where group of misfits follow a treasure map "given" to them by a character of the name of 3 eyed Jack.

Arnold hits Harold with a baseball, so Harold promises Arnold that he'll beat him the next day. He gets nervous until he acts crazy to stop him from getting beat up.

In '6th Grade Girls', Arnold and Gerald are invited to a school dance by two girls to make their boyfriends jealous. / In 'The Baseball', Mickey Kalin is Arnold's favorite player and is going to retire and Arnold wants to go to his last game.

Arnold's pet pig, Abner, escapes one night while Arnold is sleeping. When Arnold tries to bring Grandpa's pocket watch home from the repair shop, he accidentally drops it down a hole in the street, which leads him to a strange subterranean world.

It's April Fools and Helga has targeted Arnold as her practical joke victim for the day. When Helga goes one prank too far, Arnold stages a retaliation and brings in Grandpa's prized practical joke.

Arnold accidentally breaks a promise he made to Iggy and must deal with the consequences. / Big Bob hires a nanny for Helga. Helga fights the nanny at her own game and forces her to leave.

After Arnold saves Sid from injury, Sid devotes himself to paying Arnold back with unending kindness. Arnold and Gerald play hookey but their day is thwarted by intense paranoia.

Arnold Pays His Cousin Arnie A Visit And It Turns Out To Be Much Like Being In The Twilight Zone. Wolfgang Tells Chocolate Boy That If He Can Go Two Weeks Without Chocolate,

When Arnold receives Mr. Hyunh's name in the boarding house's annual Secret Santa draw, he decides to make it the most special Christmas ever for the lonely boarder, and tries to reunite Mr. Hyunh with his long-lost daughter. Meanwhile, Helga agonizes over what would make the perfect present for Arnold.

Arnold can't bear to face the world bareheaded. Where can it be? Helga's not talking.

Arnold lends Sid his room for one evening, but the arrangement backfires when Sid keeps on borrowing the room. / Helga and Patty (the big girl) face off.

Arnold is fed up with the bickering amongst the boarders and sets out to find the true meaning of the holiday.

Arnold gets a visit from his French pen pal Cecille, who behind her French accent, seems strangely familiar.

The guys find a bag of money and they want to split it up right away. When Principal Wartz gets fed up with unappreciative children, he quits and follows his life-long dream of being a lounge singer.

During A Game Of Baseball, Arnold Pops A Fly Ball And It Hits Helga In The Head. Grandpa Is Paid A Visit By His Old Friend Jimmy, Which Sparks Up His Competitive Nature.

When Arnold discovers that Oskar has been pretending to know how to read, Arnold confronts him./Big Bob pulls his back and cannot go to a very important meeting. Not knowing who else to send in his place, he asks Helga.

Arnold has trouble with the basketball coach and his favored son. Arnold becomes friend with "cool" Frankie G., but his new friend only succeeds in getting him into trouble.

The Coach wants to remarry Tish and asks Arnold to be his best man. / Rhonda has a party and only invites the cool kids. Arnold attends, but realizes her party is only for snobs.

Sid gets in over his head when doing business with the local kid loan shark, Big Gino./Gerald's big brother, Jamie O, falls for a girl and suddenly turns nice to his kid brother.

Arnold gets paired with the bitter Jolly Olly Man as part of Career Day, but helps to change both their outcomes. / Harold is invited to Rhonda's party and befriends the female bully, Big Patty.