The 1979 Sigourney Weaver film is 'ALIEN'. It is a science fiction horror film directed by Ridley Scott and starring Sigourney Weaver, Tom Skerritt, Veronica Cartwright, Harry Dean Stanton, John Hurt, Ian Holm, and Yaphet Kotto. The film follows the crew of the commercial space tug Nostromo, who encounter the eponymous ALIEN, a deadly and aggressive extraterrestrial set loose on the ship. It was released to critical acclaim and box office success, becoming one of the highest-grossing films of 1979 and winning an Academy Award for Best Visual Effects.