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Galaxy Quest

The cast of the 1980s space-adventure series Galaxy Quest attend fan conventions and make trivial promotional appearances. Though the series' vain former star, Jason Nesmith, thrives on the attention, his co-stars Gwen DeMarco, Alexander Dane, Fred Kwan, and Tommy Webber resent him and their stalled careers. At a convention, a group calling themselves Thermians approaches Jason for help. Thinking they want him for a promotional appearance, he agrees. Jason also overhears two attendees mocking him and the fans. Despondent, he brusquely dismisses other fans, including Brandon, before going home to drink and watch reruns of the series.

The next morning, when the Thermians pick him up, a hungover Jason does not grasp that they are actual aliens who have transported him to a working re-creation of the Galaxy Quest starship, the NSEA Protector. Jason believes he is on a set, and performs in character as he confronts the Thermians' enemy, Sarris, who demands the "Omega 13", a secret super weapon with unknown capabilities mentioned but never used in the show's finale. Giving perfunctory orders, Jason fires on and temporarily defeats Sarris.

After the grateful Thermians transport him back to Earth, Jason realizes the experience was real and attempts to convince the other cast members. In his excitement, Jason bumps into Brandon again, accidentally swapping Brandon's toy communicator with a real one Jason acquired from the Thermians. When one of the Thermians, Laliari, seeks Jason's help again, the cast joins him, along with the convention emcee, Guy, who had played an ill-fated extra 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the cast learn that the Thermians, who possess no concept of fiction, believe the episodes of Galaxy Quest are true "historical documents".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. He 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 alien miners. Jason is temporarily left behind and fends off a rock creature until Fred beams him up. Back on the Protector, the crew discovers 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 contact Brandon via the swapped communicator, and Brandon and his superfan friends guide them to abort the self-destruct sequence. Brandon also explains that the Omega 13 is either a universe-destroying bomb or a "matter re-arranger" that sends the user 13 seconds back in time. Meanwhile, Alexander leads a Thermian revolt 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 narrowly 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, allowing Jason and Mathesar to thwart Sarris before he attacks.

The Protector' s bridge separates from the main vessel to return the humans to Earth, while the main vessel carries the Thermians into interstellar space. The Protector bridge crashes into the Galaxy Quest convention, and the dazed cast emerges to the cheers of their fans. Sarris awakens and levels his gun at the cast, but Jason shoots and destroys him. The crowd assumes it was all a display of special effects and cheers wildly. Jason, with newfound humility, invites his co-stars to share the stage with him and 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.