The English dubbed version released in the United States as "The People Who Own the Dark" had a replacement score that included music cues from "The Blob" (1958).
Though produced in 1975, the movie didn't reach U.S. shores until 1980 (when it was reportedly released by Sean Cunningham, but he has said he has no recollection of this), with a misleading ad campaign which made it look more like a devil cult horror film than an apocalyptic sci-fi thriller. With U.S. prints reportedly running shorter than what played in Europe, the names of the cast were also removed, and the U.S. posters and ads displayed anglicized monikers or changed the cast names altogether.