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William Berger as Dr. Orloff |
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Montserrat Prous as Melissa Comfort |
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Edmund Purdom as Inspector Crosby |
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Loreta Tovar as Martha Comfort |
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Robert Woods as Sweet Davey Brown |
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Lina Romay as Sweet Davey Brown's Girlfriend |
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Kali Hansa as Lady Flora Comfort |
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Joaquín Blanco as Agent Michel |
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José Manuel Martín as Albert Mathews |
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Jaume Picas as Sir Henry Robert Comfort |
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Jesús Franco as Lord Comfort (uncredited) |
| Directing | Jesús Franco | Director |
| Editing | Roberto Fandiño | Editor |
| Crew | Antonio Millán | Cinematography |
| Writing | Jesús Franco | Screenplay |
| Directing | Anne Settimó | Assistant Director |
| Costume & Make-Up | E. Cervera de la Torre | Assistant Makeup Artist |
| Camera | Alberto Prous | Camera Operator |
| Camera | Juan Prous | Assistant Camera |
| Art | José Massagué | Set Decoration |
| Camera | Máximo L. Piedra | Still Photographer |
| Editing | Nicolás Muñoz | Assistant Editor |
| Production | Isidre Prous | Production Assistant |
| Costume & Make-Up | Hipólita López | Hairstylist |
| Costume & Make-Up | Carmen Menchala | Makeup Artist |
| Production | Antonio Cervera | Production Manager |
