A space shuttle mission investigating Halley's Comet brings back a malevolent race of space vampires who transform most of London's population into zombies. The only survivor of the expedition and British authorities attempt to capture a mysterious but beautiful alien woman who appears responsible.
- Genre: Horror, Science Fiction, Thriller
- Studio: TriStar Pictures, Cannon Group, London-Cannon Films, Golan-Globus Productions, Easedram
- Keyword: space marine, vampire, flying saucer, comet, alien, halley's comet
- Cast: Steve Railsback, Peter Firth, Frank Finlay, Mathilda May, Patrick Stewart, Michael Gothard