31 Days of Horror: Alien (1979)

Alien is a 1979 science fiction horror film directed by Ridley Scott and written by Dan O’Bannon. Based on a story by O’Bannon and Ronald Shusett, it follows the crew of the commercial space tug Nostromo, who, after coming across a mysterious derelict spaceship on an undiscovered moon, find themselves up against an aggressive and deadly extraterrestrial set loose on the Nostromo. 

The film stars Tom Skerritt, Sigourney Weaver, Veronica Cartwright, Harry Dean Stanton, John Hurt, Ian Holm, and Yaphet Kotto. It was produced by Gordon Carroll, David Giler, and Walter Hill through their company Brandywine Productions, and was distributed by 20th Century Fox.