Lifeforce
- Annu: 1985
- Paese: United Kingdom
- Genre: Horror, Science Fiction
- Studio: Golan-Globus Productions, Easedram, London-Cannon Films, The Cannon Group, TriStar Pictures
- Parolla chjave: space marine, flying saucer, vampire, comet, alien, halley's comet
- Direttore: Tobe Hooper
- Cast: Steve Railsback, Peter Firth, Frank Finlay, Mathilda May, Patrick Stewart, Michael Gothard