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Anita Ekberg as Sylvia De Morel / Malenka |
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Julián Ugarte as Count Walbrooke / Uncle |
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Gianni Medici as Dr. Pietro Lufuani |
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Diana Lorys as Bertha Zemis |
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Rosanna Yanni as Freya Zemis |
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Adriana Ambesi as Blinka |
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César Benet as Max |
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Carlos Casaravilla as Dr. Horbringer |
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Fernando Bilbao as Vladis the Coachman |
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Adriana Santucci as The Count's Maid |
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Juanita Ramírez as Brugard - the Inn's Barmaid |
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Paul Müller as Dr. Albert |
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Aurelia Treviño as Woman with Torch in a Crowd |
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Luciano Melani as Villager at the Inn (uncredited) |
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Luis Prendes as Villager Standing at the Inn (uncredited) |
| Production | Aubrey Ambert | Producer |
| Production | Rosanna Yanni | Producer |
| Sound | Carlo Savina | Original Music Composer |
| Camera | Fulvio Testi | Director of Photography |
| Editing | Antonio Gimeno | Editor |
| Directing | Amando de Ossorio | Director |
| Writing | Amando de Ossorio | Writer |
| Production | Félix Michelena | Production Designer |
| Production | Augusto Lega | Production Designer |
| Production | José María Alonso Pesquera | Line Producer |
| Art | Pablo Gago | Production Design |
| Art | Augusto Lega | Production Design |
| Art | Félix Michelena | Production Design |
| Art | Augusto Lega | Art Direction |
| Art | Félix Michelena | Art Direction |
| Art | Ennio Michettoni | Set Decoration |
| Costume & Make-Up | Antonio Nieto | Hairstylist |
| Costume & Make-Up | Manolita Ponte | Makeup Artist |
| Costume & Make-Up | Marisa Tilly | Makeup Artist |
| Costume & Make-Up | Anna Maria Zini | Hairstylist |
| Production | Alfonso Donati | Production Director |
| Directing | Juan L. Isasi | Assistant Director |
| Directing | Renato Rizzuto | Assistant Director |
| Art | Ennio Michettoni | Set Designer |
| Sound | Luís Gutiérres De Sisti | Sound |
| Camera | José García Galisteo | Camera Operator |
| Camera | Cesare Allione | Camera Operator |
| Production | Esteban Gutiérrez | Production Assistant |
| Costume & Make-Up | Marbel Jr. | Wardrobe Supervisor |