British sci-fi horror directed by Tobe Hooper. A joint Anglo-American mission headed by Commander Tom Carlsen (Steve Railsback) explores an alien spaceship discovered inside Haley's Comet and finds a trio of naked slumbering humanoid aliens. When they wake up, the aliens make quick work of Carlsen's team, sucking the life force from their unsuspecting bodies, and are soon charting a course back to Earth ready to take on the general population. Carlsen does his best to stop the invasion, but in no time at all London is placed at the mercy of beautiful vampire alien Space Girl (Mathilda May).