Directed by
| Jesús Franco | ... | (as Clifford Brown) |
Writing Credits (in alphabetical order)
| Jesús Franco | ... | (screenplay) |
| Jesús Franco | ... | (story) |
| Edgar Wallace | ... | (novel) (uncredited) |
Cast (in credits order)
| Antonio Mayans | ... | Carlos (as Robert Foster) | |
| Lina Romay | ... | Paquita la Fina | |
| Howard Vernon | ... | Profesor Albert Von Klaus | |
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Mari Carmen Nieto | ... | (as Ann Stern) |
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Tony Skios | ||
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Juan Soler | ... | Mariano / Boris (as Juan Cózar) |
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Verónica Arezchavaleta | ||
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Eugenia Farach | ... | Eugenia |
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Ramón García | ||
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Miguel Casanova | ||
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Ángel Ordiales | ... | Pablo (as Ángel Santander) |
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Juana Plaza | ... | Lina |
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Daniel Katz | ... | Paolo Moroni |
| Rest of cast listed alphabetically: | |||
| Jesús Franco | ... | Secuestrador (uncredited) | |
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José Llamas | ... | Secuestrador (uncredited) |
Music by
| Jesús Franco | ... | (as Pablo Villa) |
Cinematography by
| Juan Soler | ||
Additional Crew
| Rosa María Belda | ... | voice dubbing: Eugenia Farach (uncredited) |
| Juan Antonio Castro | ... | voice dubbing (uncredited) |
| José María del Río | ... | voice dubbing: Juan Soler (uncredited) |
| Jesús Franco | ... | voice dubbing (uncredited) |
| Antonio Requena | ... | voice dubbing: various (uncredited) |