Page "Galaxy Quest" Paragraph 6

The Thermians transport Jason onto the Protector to negotiate with Sarris ( named after respected film critic Andrew Sarris ), a reptilian humanoid warlord waging a genocidal war against the Thermian people.

Sarris demands the Omega 13, a device used at the very end of Galaxy Quests final episode.

Still believing the situation is fictional, Jason orders the Thermians to fire upon Sarris's spaceship and then insists on returning home, but when they send him through space to Earth, he finally realizes the events were real.

The Thermians then come back to Earth and ask for more help negotiating a surrender with Sarris.

Jason, believing Sarris is the one to surrender, asks his co-stars to join him, and they agree, believing that the mission is just an acting job.

Once the actors are onboard the Protector, they finally realize the truth, but Sarris prevents them from leaving, so they assume their television roles in order to save the Thermians, who have very little concept of deception, or the art of acting / theater.