calm even when danger is present. His tools included a scanner for sensing danger, a welder and a buzz saw. http://robotics.learnhub.com/lesson/7174-cool-movie-robots-part-1 Alien is a 1979 science fiction horror film directed by Ridley Scott and starring Tom Skerritt , Sigourney Weaver , Veronica Cartwright , Harry Dean Stanton , John Hurt , Ian