Directed by
| Jesús Franco | ... | (as Frank Hollmann) |
Writing Credits
| Jesús Franco | ... | (written by) (as Frank Hollmann) |
Cast (in credits order) verified as complete
| Soledad Miranda | ... | Mrs. Johnson (as Susann Korda) | |
 |
Fred Williams | ... | Dr. Johnson |
| Paul Muller | ... | Dr. Franklin Houston (as Paul Müller) | |
| Howard Vernon | ... | Prof. Jonathan Walker | |
| Ewa Strömberg | ... | Dr. Crawford (as Ewa Stroemberg) | |
| Horst Tappert | ... | Inspector | |
| Rest of cast listed alphabetically: | |||
| Jesús Franco | ... | Dr. Donen (uncredited) | |
|
|
Rudolf Hertzog | ... | Member of the Medical Congress (uncredited) |
|
|
Karl Heinz Mannchen | ... | Member of the Medical Congress (uncredited) |
Produced by
| Artur Brauner | ... | producer |
| Karl Heinz Mannchen | ... | executive producer |
| Arturo Marcos | ... | producer |
Music by
| Manfred Hübler | ||
| Bruno Nicolai | ||
| Sigi Schwab | ... | (as Siegfried Schwab) |
Cinematography by
| Manuel Merino | ||
Editing by
| Clarissa Ambach | ||
Production Management
| Rudolf Hertzog | ... | production manager (as Rudolph Hertzog Jr.) |
Second Unit Director or Assistant Director
| Anne Settimó | ... | assistant director (as Ani Settimo de Esteva) |
Additional Crew
| Christian Brückner | ... | voice dubbing: Fred Williams (uncredited) |
| Gerd Duwner | ... | voice dubbing: Jesús Franco (uncredited) |
| Almut Eggert | ... | voice dubbing: Ewa Strömberg (uncredited) |
| Arne Elsholtz | ... | dialogue director (uncredited) |
| Renate Küster | ... | voice dubbing: Soledad Miranda (uncredited) |
| Gerd Martienzen | ... | voice dubbing: Paul Muller (uncredited) |
| Heinz Petruo | ... | voice dubbing: Howard Vernon (uncredited) |
