MPAA Rating: R/ Genre: Sci-Fi-Horror/ Stars: Tom Skerritt, Sigourney Weaver, Veronica Cartwright, Harry Dean Stanton, John Hurt, Ian Holm, Yaphet Kotto/ Runtime: 116 minutes As the credits of “Alien” open, the slowly paced opening titles and soft, eerie score give off a subtle hint of just what exactly the viewer…