Cops and a reporter attempt to capture a mysterious killer plaguing the city.
| Directing | Ramón Barco | Director |
| Writing | Paul Naschy | Story |
| Camera | Emilio Foriscot | Director of Photography |
| Editing | María Luisa Soriano | Editor |
| Art | Ángel Arzuaga | Set Decoration |
| Costume & Make-Up | Fernando Florido | Makeup Artist |
| Costume & Make-Up | Dolores García Rey | Assistant Makeup Artist |
| Production | Ángel Parrondo | Production Manager |
| Directing | Bernardo Fernández | Assistant Director |
| Camera | Francisco Frutos | Still Photographer |
| Camera | Francisco Beringola | Assistant Camera |
| Camera | José F. Ariznavarreta | Assistant Camera |
| Costume & Make-Up | Juana Ramírez | Seamstress |
| Editing | Renata Merino | Assistant Editor |
| Production | Salvador Casado | Production Assistant |
| Sound | Ángel Arteaga | Original Music Composer |
| Writing | Juan José Daza | Story |
| Writing | Juan José Porto | Story |
| Writing | Juan José Porto | Screenplay |
| Writing | Ramón Barco | Screenplay |
