A man suffers from the curse of lycanthrope and seeks help from doctor and wife team. They both turn out to be vampires and end up dueling it out with the werewolf star.
| Directing | Enrique López Eguiluz | Director |
| Writing | Paul Naschy | Screenplay |
| Camera | Emilio Foriscot | Director of Photography |
| Art | José Luis P. Ferrer | Production Design |
| Sound | Ángel Arteaga | Original Music Composer |
| Production | Maximiliano Pérez-Flores | Executive Producer |
| Editing | Francisco Jaumandreu | Editor |
| Writing | Paul Naschy | Story |
| Costume & Make-Up | Ines Gonzales | Hairstylist |
| Costume & Make-Up | José Luis Ruiz | Makeup Artist |
