Galaxy Quest
Release date: Dec, 23rd 1999 (US)

The stars of a 1980s sci-fi show—now eking out a living through re-runs and sci-fi conventions—are beamed aboard an alien spacecraft. Believing the cast's heroic on-screen dramas are historical documents of real-life adventures, the band of aliens turn to the cast members for help in their quest to overcome the oppressive regime in their solar system.
Director: Dean Parisot.
Starring: Tim Allen, Sigourney Weaver, Alan Rickman, Tony Shalhoub, Sam Rockwell, Daryl Mitchell and more.