 This was promoted and filmed under the title "The Space Vampires"  (the title of Colin Wilsons novel). However, Menahem Golan and  Yoran Globus Cannon Films reportedly spend nearly $25 million in  hopes of creating a full blown blockbuster. They felt that this  title made it sound like a typical Cannon low budget exploitation  film. The title was changed to "Lifeforce" and it was released in  the United States in an edited version which brought in less than  half of its production cost.