It was filmed in early Spring, 1969. The film was first released theatrically in Germany (as Dracula vs Frankenstein) on February 24, 1970, and in Spain (as The Monsters of Terror) on August 28, 1971.
The film was shot during the early spring of 1969. It premiered theatrically in Germany as "Dracula vs Frankenstein" on February 24, 1970, and later in Spain as "The Monsters of Terror" on August 28, 1971.