Seventh in a series about werewolf Count Waldemar Daninsky, played by Paul Naschy. This film ignored the events in all of the earlier "Hombre Lobo" films and began a whole new origin for the Wolfman.
The film was released theatrically in its native Spain in 1974, and in the US by Goldstone Film Enterprises in 1976. It was released on VHS as "The Black Harvest of Countess Dracula" and as "Curse of the Devil". The film was released on DVD by Anchor Bay Entertainment in 2002 as "Curse of the Devil". It was subsequently re-released in a special edition in 2008 by Deimos Entertainment, a subdivision of BCI Eclipse, under the same title.
Part of the terrain in the movie is signposted as the Borgo Pass; well-known from Bram Stoker's novel as being the beginning of Count Dracula's domain.