TCM | 9:45 pm

Sigourney Weaver made her big-screen starring debut in this 1979 sci-fi horror classic, originating a role she has carried through several sequels. She plays Ellen Ripley, an officer aboard an interplanetary mineral-hauling spaceship that answers an apparent call for help and ends up with a slimy, murderous stowaway. The sight of an unfortunate crew member (John Hurt) giving birth to the alien's spawn is one of the cinema's great gross-out scenes. Tom Skerritt also stars in the film, airing tonight as part of a lineup of space-mission movies.