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