El Retorno de Walpurgis
El Retorno de Walpurgis (The Return of Walpurgis, also known as Curse of the Devil and The Black Harvest of Countess Dracula) is a 1973 Mexican-Spanish horror film that is the seventh in a series about the werewolf Count Waldemar Daninsky, played by Paul Naschy. This film ignored the events in all of the earlier films and began a whole new origin for el Hombre Lobo.
When the wealthy Count Waldemar Daninsky kills a wolf on his grounds, it transforms into a Gypsy upon death, and he finds himself cursed by a vengeful Gypsy witch, who is angry about him killing one of her band. The witch orders a young, beautiful Gypsy girl to seduce Daninsky and then, while he is sleeping, bite him with the skull of a wolf which she smuggles into the Count's mansion. When she presses the skull's fangs into his skin, Waldemar becomes a werewolf (without a doubt, this is the most original of all of Waldemar's various "origins" in the series).