Galaxy Quest (1999)
In this enormously entertaining send-up of the Star Trek universe, a bunch of actors from a cult sci-fi TV show are mistaken for the real thing and recruited to defend a dying alien race.
Almost 20 years after the cancellation of their TV show, the actor crew of the spaceship Protector encounters a strange group of fans at a convention.
These turn out to be real-life aliens who, unaware of the difference between fact and fiction, believe that only the cast of Galaxy Quest can save them from Sarris, a ruthless warmonger.
It's an inspired premise, fired into orbit by a fantastic script, sublime visual effects and an absolutely perfect cast, including Tim Allen, Sigourney Weaver and Alan Rickman, who's hysterical as a grumpy British actor who hates his half-reptilian character, Dr Lazarus.
The story is so cleverly executed and the characters so beautifully fleshed-out that it not only succeeds as a Trek spoof, a satire on the acting profession and a parody of science-fiction fans, but also as an engaging, original space saga in its own right.
Jason Nesmith/Commander Peter Quincy
Gwen DeMarco/Lt Tawny Madison
Alexander Dane/Dr Lazarus
Fred Kwan/Tech Sgt Chen