The original Alien is equal parts horror and science fiction. The brilliantly paced 1979 film tells the story of a crew on a spaceship that prematurely awakens from a long slumber to battle an alien that emerges from the stomach of one of the men. The gruesome creature stalks the crew and picks them off one by one, until Ripley (played by Sigourney Weaver) fights back. The alien is every bit as cunning and devious as Michael Myers or Jason Voorhees, and like those villains it came back and back in many sequels. There have been rumors for years about a final movie where the aliens finally come to Earth, but it seems unlikely that will ever happen.