Here he comes to swinging seventies' London, seeking a cure to his malady. Unfortunately, he meets Dr. Jekyll who injects him with a serum that turns him into the lascivious killer Mr. Hyde. In his top hat and black cloak, Hyde haunts the fleshpots of Soho, while two gorgeous women fight for possession of his wolfman soul...
| Directing | León Klimovsky | Director |
| Writing | Paul Naschy | Story |
| Sound | Antón García Abril | Original Music Composer |
| Production | Alfredo Fraile | Executive Producer |
| Production | Arturo González | Producer |
| Camera | Francisco Fraile | Director of Photography |
| Crew | Miguel Sesé | Makeup Effects |
| Writing | Paul Naschy | Screenplay |
| Editing | Petra de Nieva | Editor |
| Costume & Make-Up | Miguel Sesé | Makeup Artist |
| Art | José Algueró | Set Decoration |
| Crew | Antonio Molina | Special Effects |
