El Retorno de Walpurgis (The Return of Walpurgis), better known as Curse of the Devil, is a 1973 werewolf film. It is the sixth film featuring Waldemar Daninsky.
- Paul Naschy as Waldemar Daninsky/Irineus Daninsky
- Fabiola Falcón as Kinga Wilowa
- Mariano Vidal Molina as Roulka
- Maritza Olivares as Maria Wilowa
- José Manuel Martín as Bela
- Eduardo Calvo as Laszlo Wilowa