After the grateful Thermians transport him back to Earth, Jason realizes the experience was real and attempts to convince the other cast members. When the Thermian Laliari seeks Jason's help again, the cast join him, along with the convention [[Master of ceremonies|emcee]], Guy, who had played an ill-fated [[redshirt (stock character)|redshirt]] in one episode. Aboard the ''Protector'', the cast learn that the Thermians, who possess no concept of fiction, believe the episodes of ''Galaxy Quest'' are true "historical documents". Inspired by the crew's adventures, they have based their society on the virtues espoused by the show.
Sarris returns, and demands the "Omega 13" device. andHe attacks the ''Protector'' again, and the ship barely escapes through a magnetic minefield. However, the ship's power source, a [[beryllium]] sphere, is severely damaged. The humans travel to a nearby planet and take a replacement sphere from ferocious, childlike aliensalien miners. On their return to the ''Protector'', they discover that Sarris has seized the ship. After Jason confesses they are just actors, Sarris forces him to explain the truth to the disillusioned Thermian leader, Mathesar. Sarris activates the ''Protector'''s [[self-destruct]] mechanism and returns to his ship.
Jason and Gwen manage to abort the self-destruct sequence by communicatingfollowing withinstructions from Brandon, the leader of a group of ''Galaxy Quest'' superfans back on earth. Meanwhile, Alexander leads thea Thermian Thermiansrevolt against Sarris' forces and takes back control of the ''Protector''. With renewed confidence, the crew challenges Sarris and draws his ship into the magnetic minefield, destroying it. As they return to Earth, Sarris, who escaped his ship's destruction, ambushes them on the bridge and fatally wounds several crew members. Jason activates the "Omega 13", which sends everyone 13 seconds back in time and gives Jason and Mathesar a chance to stun and disarm Sarris before the attack.
The ''Protector'''s bridge separates from the main vessel to landreturn the humans onto Earth, while the main vessel carries the Thermians into interstellar space. The ''Protector'' bridge crashes into a ''Galaxy Quest'' convention, and the dazed cast emerges to the cheers of their fans. Sarris awakens and comeslevels afterhis themgun at the cast, but Jason shoots and destroys him. Sarris explodes, and theThe crowd assumes everythingit was all a display of special effects and cheers wildly, while the crew basks in their newfound glory.
Sometime later, ''Galaxy Quest'' is revived as a sequel series, ''Galaxy Quest: The Journey Continues'', with the cast reprising their roles alongside Guy and Laliari as new cast members.
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