Directed by
| Isidoro M. Ferry | ... | (as I.M. Ferry) |
| William J. Hole Jr. | ... | (US footage) |
Writing Credits
| Monroe Manning | ... | (story) |
| Monroe Manning | ... | (screenplay) |
Cast (in credits order)
| Lisa Gaye | ... | Norma Borden | |
| Fernando Rey | ... | Dr. Charles Taylor | |
| Virgilio Teixeira | ... | Matt Wilder (as Virgilio Texeira) | |
| Gérard Tichy | ... | Dr. Chambers (as Gerard Tichy) | |
| Carlos Casaravilla | ... | Dr. Reich | |
| Emilio Rodríguez | ... | Inspector Hopkins (as Emilio Rodriguez) | |
| Jacinto San Emeterio | ... | Polack | |
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Eduardo Sancho | ... | Mandel |
| Pepe Martín | ... | Alec (as Jose Martin) | |
| Ana María Custodio | ... | Nurse (as Ana Mª Custodio) | |
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Pedro Hurtado | ... | Philips |
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Miguel del Castillo | ... | Hospital Doctor |
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Guillermo Carmona | ... | Harry |
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Ángel Celdrán | ... | Mental Patient |
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José Rein Loring | ... | Receptionist |
| Concha Cuetos | ... | Alma Woods (as Conchita Cuetos) | |
| Rest of cast listed alphabetically: | |||
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Agustín Bescos | ... | Board Member (uncredited) |
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Sergio Mendizábal | ... | Police Doctor (uncredited) |
Produced by
| Jack Miles | ... | executive producer |
Music by
| José Buenagú | ||
Cinematography by
| José F. Aguayo | ||
Editing by
| Antonio Ramírez de Loaysa | ... | (as Antonio Ramírez) |
Set Decoration by
| Sigfrido Burmann | ... | (as Sigfrido Burman) |
Makeup Department
| Manolita Castro | ... | hair stylist |
| Fernando Martínez | ... | makeup artist |
Production Management
| Gustavo Quintana | ... | production manager |
Second Unit Director or Assistant Director
| José Luis Marcos | ... | second assistant director |
| Manuel San Román | ... | assistant director |
Art Department
| Guillermo Alcázar | ... | property master |
| Wolfgang Burmann | ... | assistant set decorator (as W. Burman) |
| Rafael García | ... | construction coordinator (as R. Garcia) |
Sound Department
| Gabriel Basagaña | ... | sound technician (as G. Basagaña) |
| Julio Calvo | ... | sound assistant |
| William J. Hole Jr. | ... | dubbing director: US version |
| Monroe Manning | ... | dubbing director: US version |
| Juan Otero | ... | sound assistant |
Camera and Electrical Department
| Víctor Benítez | ... | still photographer |
| Francisco Gómez Conde | ... | assistant camera (as F. Gomez Conde) |
| Ricardo Poblete | ... | camera operator |
Costume and Wardrobe Department
| Isabel Pastor | ... | costumer |
Editorial Department
| Clorinda Cáceres | ... | assistant editor |
Script and Continuity Department
| Luis S. Enciso | ... | script supervisor (as Luis Enciso) |
Additional Crew
| Albano | ... | dancer |
| Ricardo Bonilla | ... | production assistant |
| Mercedes | ... | dancer |
| Jack LeRoy Miles | ... | producer, american dubbing |
| James LeRoy Miles | ... | producer, american dubbing |
| Ángel Quintana | ... | production assistant |
| Francisco Ruiz Camps | ... | second production assistant (as F. Ruiz Camps) |
| Vicente Bañó | ... | voice dubbing: Emilio Rodríguez (uncredited) |
| Manuel de Juan | ... | voice dubbing: Carlos Casaravilla (uncredited) |
| Rafael de Penagos | ... | voice dubbing: Virgilio Teixeira (uncredited) |
| María del Puy | ... | voice dubbing: Concha Cuetos (uncredited) |
| José Guardiola | ... | voice dubbing: Gérard Tichy (uncredited) |
| Mari Ángeles Herranz | ... | voice dubbing: Lisa Gaye (uncredited) |
| Jesús Nieto | ... | voice dubbing: Jacinto San Emeterio (uncredited) |
| Simón Ramírez | ... | voice dubbing: Pedro Hurtado (uncredited) |