I usually struggle with comedy movies - but a combination of great casting; good, well-paced comedy writing and some lovely special effects from Stan Winston keep this rollicking along with loads of tongue-in-cheek swipes at the sci-fi genre (and "Star Trek" in particular) that is done in a sympathetic, engaging fashion. The "crew" are a bunch of washed-out actors doing the comic-con rounds with Tim Allen as the supercilious Captain: Alan Rickman - a wonderfully aloof thespian playing the disillusioned semi-crustacean ship's doctor; Sigourney Weaver as the buxom, but largely pointless "Tawny Madison" and Tony Shalhoub as the engineer on the "NSEA Protector". At one such event, they encounter the "Thermians" who need help battling the evil, all-conquering "Sarris". Having seen the telecasts of "Galaxy Quest" and treated them as actual historical documents the "Thermians" have built a real starship and hope the crew can be as true to their characters as they were to their scripts and save everyone's bacon... They are all on good form here, even poor old Sam Rockwell in the sort of Trekkie "red shirt" role (who expects to be killed at any moment). Perhaps not quite laugh out loud, but if you are a fan of this genre then you cannot fail to frequently raise a smile at the fight scenes that are comically staged; off course the captain's shirt gets ripped - and everyone finds a tiny bit of heroism in their persona. I loved it!