Patrick Allen also did the voiceover for the UK trailer of this film.
Christopher Lee has called it his favorite Hammer film.
Done at Christopher Lee's insistence that Hammer do a film based on a Wheatley fantasy novel.
Hammer first wanted actor Gert Fröbe in the role of Mocata.
The movie's US title was changed to "The Devil's Bride" because its original title made it sound much too much like a Western.