Directed by
| Antonio Margheriti | ... | (as Anthony Dawson) |
Writing Credits
| Ernesto Gastaldi | ... | (story) (as Julian Berry) |
| Tonino Valerii | ... | (screenplay) (as Robert Bohr) |
| Antonio Margheriti | ... | (screenplay) (uncredited) |
| Tonino Valerii | ... | (dialogue) (as Robert Bohr) |
Cast (in credits order) verified as complete
| Barbara Steele | ... | Helen Karnstein / Mary Karnstein | |
| George Ardisson | ... | Baron Kurt Humboldt | |
| Halina Zalewska | ... | Lisabeth Karnstein / Adele Karnstein | |
| Umberto Raho | ... | Von Klage, the Priest (as Robert Rains) | |
| Laura Nucci | ... | Grumalda (as Laureen Nuyen) | |
| Giuliano Raffaelli | ... | Count Humboldt (as Jean Rafferty) | |
| Nello Pazzafini | ... | Monk, the Servant (as John Carey) | |
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Jeffrey Darcey | ... | the Messenger |
| Rest of cast listed alphabetically: | |||
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Aldo Barozzi | ... | Plague Victim (uncredited) |
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Severino D'Ottavi | ... | Party Guest (uncredited) |
| Alba Maiolini | ... | Wife of Plague Victim (uncredited) | |
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Enzo Mondino | ... | Villager at the Execution (uncredited) |
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Piero Pastore | ... | Baron Von Letz (uncredited) |
Produced by
| Felice Testa Gay | ... | producer (as F. Testa Gay) |
Music by
| Carlo Rustichelli | ... | (as Evirust) |
Cinematography by
| Riccardo Pallottini | ... | (as Richard Thierry) |
Editing by
| Mario Serandrei | ... | (as Mark Sirandrews) |
Art Direction by
| Giorgio Giovannini | ... | (as George Greenwood) |
Set Decoration by
| Enrico Fiorentini | ... | (as Henry Fraser) |
Costume Design by
| Ugo Pericoli | ... | (as Humphrey Patterson) |
Makeup Department
| Italia Cambi | ... | hair stylist (as Florence Clark) |
| Euclide Santoli | ... | makeup artist (as Edmund Stroll) |
Production Management
| Renato Caldonazzo | ... | post production supervisor: English version |
| Ferruccio De Martino | ... | production manager (as Fred Dexter) |
| Arduino Mercuri | ... | production supervisor (as Dean Morris) |
| Paolo Mercuri | ... | production supervisor (as Paul Meredith) |
Second Unit Director or Assistant Director
| Nino Fruscella | ... | assistant director (as Guy Farell) |
| Roberto Pariante | ... | assistant director (as Bob Parks) |
Sound Department
| Giulio Tagliacozzo | ... | sound (as John Tamblyn) |
Camera and Electrical Department
| Ubaldo Terzano | ... | camera operator (as Humbert Tennberg) |
Additional Crew
| Ettore Catalucci | ... | laboratory director (as E. Catalucci) |
| Giorgio Capecchi | ... | voice dubbing: Giuliano Raffaelli (uncredited) |
| Emilio Cigoli | ... | voice dubbing: Umberto Raho (uncredited) |
| Maria Pia Di Meo | ... | voice dubbing: Barbara Steele (uncredited) |
| Flaminia Jandolo | ... | voice dubbing: Halina Zalewska (uncredited) |
| Giuseppe Rinaldi | ... | voice dubbing: George Ardisson (uncredited) |
| Lydia Simoneschi | ... | voice dubbing: Laura Nucci (uncredited) |
