 In 1985, the book was adapted to film as "Lifeforce", directed by Tobe Hooper.Later, in June 1985, the original novel was reissued as a movie tie-in to accompany the film's original theatrical release, under the same title as its movie counterpart.The movie differs in many respects from the novel; it is set in the modern day (using the 1986 flyby of Halley's Comet as a plot element), and the character of Carlsen (an American colonel named Tom) is much weaker, with a more obsessive relationship to the female vampire.