Directed by
| Andrea Bianchi | ... | (as A. Frank Drew White) |
| Jesús Franco | ... | (unfinished) (uncredited) |
Writing Credits
| Georges Friedland | ... | (screenplay) (as Gregory Freed) & |
| Marius Lesoeur | ... | (screenplay) (as A.L. Mariaux) & |
| Jesús Franco | ... | (screenplay) (as D. Khunn) |
Cast (in credits order) complete, awaiting verification
| Christopher Mitchum | ... | Wolfgang von Backey | |
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Suzanne Andrews | ... | Eva |
| Fernando Rey | ... | Ohmei Felsberg | |
| Howard Vernon | ... | Dr. Josef Mengele | |
| Jack Taylor | ... | Aaron Horner | |
| Dora Doll | ... | Sarah | |
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Jean-Claude Lerner | ... | (as J.C. Lerner) |
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Shirley Knight | ... | Gertrud |
| Antonio Mayans | ... | Marc Logan (as Robert Foster) | |
| Rest of cast listed alphabetically: | |||
| Manuel Alexandre | |||
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Rafael Corés | ||
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Helena Garret | ||
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Annick Laine | ... | Rachel |
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Emilio Linder | ... | Mickey |
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José Llamas | ||
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Marc Otting | ... | (as Marc Ortt) |
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Patrick Pankard | ... | (as Kevin Connors) |
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Anthony Parker | ||
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Anthony Parker | ||
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Lola Quesada | ||
| Lina Romay | |||
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Juan Soler | ||
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Draguy Steiner | ... | (as Draky Stainer) |
| Manuel Zarzo | ... | Doctor Hess (as Manolo Zarzo) | |
| José Miguel García Marfa | ... | Killer in hotel lobby (uncredited) | |
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Carlos Ysbert | ... | David (uncredited) |
Produced by
| Daniel Lesoeur | ... | producer |
| Marius Lesoeur | ... | executive producer (as A.L. Mariaux) |
Music by
| Norbert Verrone | ... | (as N. Verrone) |
Cinematography by
| Roger Fellous | ... | (as Roy Fellous) |
| Juan Soler | ... | (uncredited) |
Editing by
| Pierre B. Reinhard | ... | (as Peter Reinhardt) |
Costume Design by
| Annick Laine | ... | (as Ann Laynn) |
Production Management
| Rick Bigot | ... | unit manager |
Second Unit Director or Assistant Director
| Daniel Jouanisson | ... | assistant director (as Dan Johnson) |
| Phil Wyatt | ... | assistant director |
Sound Department
| John Comon | ... | sound mixer |
| Benjie Klaus | ... | sound effects |
| Jean-Claude Reboul | ... | sound (as J.C. Rebull) |
Special Effects by
| Jean Manuel Costa | ... | special effects (as J.M. Costa) |
Stunts
| Johnny Polck | ... | stunt coordinator |
Camera and Electrical Department
| Luis Colombo | ... | camera operator |
| Alain Hardy | ... | camera operator (as Alan Hardy) |
Script and Continuity Department
| Ilona Kunesova | ... | script supervisor |
Additional Crew
| Michael Ray | ... | titles |