Galaxy Quest

The alumni cast of a space opera television series have to play their roles as the real thing when an alien race needs their help. However, they also have to defend both Earth and the alien race from a reptilian warlord.

Galaxy Quest is a 1999 adventure sci-fi movie directed by Dean Parisot, starring Sigourney Weaver, Alan Rickman, Tim Allen. It holds an IMDb rating of 7.4/10 from 191,983 votes and runs 1h 42m.