Released on June 21, 1985, is a high-concept science fiction horror film directed by Tobe Hooper and produced by Cannon Films. Based on Colin Wilson's 1976 novel The Space Vampires , the film follows a space shuttle crew that discovers three humanoid aliens in the tail of Halley's Comet; after being brought back to London, these entities begin draining the "life force" from humans, triggering an apocalyptic plague. Production and Creative Vision Lifeforce (1985) - IMDb