Is this high concept or just out of this world? When the Thermians are in danger of extinction at the hands of a reptilian warlord, they seek help from earth in the form of the cast of a canceled TV series, Galaxy Quest. Episodes of the Star Trek lookalike had been intercepted by the highly advanced Thermians who, in fact, can't fathom fiction. The “crew” joins the mission commander Jason Nesmith (Tim Allen), the ship's science officer (Alan Rickman), chief engineer Kwan (Tony Shalhoub), and the best star date around, Officer DeMarco (Sigourney Weaver). Will the universe be saved from the Omega 13 device? You can't be Sirius.