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Fernando Casanova as Dr. Malthus/Gonzalo Malthus |
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Sonia Furió as Rosa |
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Rosa Maria Gallardo as Última raptada |
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Guillermo Cramer as Inspector de policía |
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Aurora Alvarado as Luisa |
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Juan José Martínez Casado as Alcaide |
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Pedro de Aguillón as Capellán |
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Guillermo Bravo Sosa as Remigio (uncredited) |
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Edmundo Espino as Antonio (uncredited) |
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Armando Velasco as Tío de Rosa (uncredited) |
| Crew | Juan Muñoz Ravelo | Special Effects |
| Editing | Alfredo Rosas Priego | Editor |
| Production | Alfredo Ripstein Jr. | Producer |
| Writing | Fernando Cortés | Writer |
| Art | Rafael Suárez | Set Decoration |
| Camera | José Ortiz Ramos | Director of Photography |
| Sound | Gustavo César Carrión | Original Music Composer |
| Costume & Make-Up | Armando Meyer | Makeup Artist |
| Production | César Santos Galindo | Executive Producer |
| Art | Gunther Gerszo | Production Design |
| Costume & Make-Up | Esperanza Gómez | Hairstylist |
| Writing | José María Fernández Unsáin | Story |
| Writing | Alfredo Varela | Adaptation |
| Art | Gunther Gerszo | Art Direction |
| Writing | H.P. Lovecraft | Short Story |
| Directing | Fernando Cortés | Director |
