It was shown in Germany originally on August 7, 1974, as Night of the Diabolical Orgy, then was re-released on October 7, 1974, as Die Todeskralle des Grausamen Wolfes / Death Claws of the Cruel Wolves.

The witch summons Satan (a thin, uncredited actor in a head-to-toe black leotard) who participates in a nocturnal orgy with some of the nubile gypsy girls in the woods.

The witch then orders a young, beautiful Gypsy girl named Ilona to seduce Daninsky and then, while he is sleeping, to bite him with the skull of a werewolf which she smuggles into the Count's mansion.

The gypsy then flees from Waldemar's mansion into the woods, where strangely she is decapitated by an axe-wielding escapee from a mental hospital for which the local police have been searching.

Meanwhile, an aged surveyor Laszlo Wilowa rents a cabin on Waldemar's estate, and moves in with his blind wife and his two beautiful young daughters, Marie and Kinga.

Waldemar manages to murder the local police inspector before being stabbed to death by Kinga with a silver dagger plunged into his heart.

The film was released theatrically in its native Spain as El Retorno de Walpurgis in September 1973, in Germany as Die Todeskralle des Grausamen Wolfes (The Death Claws of the Cruel Wolves) in July 1974, in the U.K. as Curse of the Devil in 1976 (on a double bill with Amando de Ossorio's Return of the Evil Dead), and in the United States as Curse of the Devil in 1976.

It was also released as a German language Blu-ray from Subkultur under the title Die Todeskralle des Grausamen Wolfes.