Directed by
| Antonio Margheriti | ... | (as Anthony Dawson) |
Writing Credits
| Giovanni Simonelli | ... | (story) (as John Simonelli) |
| Antonio Margheriti | ... | (screenplay) (as Anthony Dawson) and |
| Franco Bottari | ... | (screenplay) (as Frank Bottar) |
| Mario Bava | ... | (screenplay) (uncredited) |
| Brian Degas | ... | (screenplay) (uncredited) |
| Tudor Gates | ... | (screenplay) (uncredited) |
Cast (in credits order) complete, awaiting verification
| Mark Damon | ... | Richard Barrett | |
| Eleonora Brown | ... | Lucille Moffat | |
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Sally Smith | ... | Jill |
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Patrizia Valturri | ... | Denise |
| Michael Rennie | ... | Inspector Durand | |
| Betty Low | ... | Mrs. Clay / Peter Moffat (as Ludmila Lvova) | |
| Luciano Pigozzi | ... | La Foret (as Alan Collins) | |
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Franco De Rosa | ... | Detective Gabon (as Franco Derosa) |
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Vivian Stapleton | ... | Miss Transfield (as Vivienne Stapleton) |
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Ester Masing | ... | Miss Martin (as Esther Masing) |
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Aldo De Carellis | ... | Professor André (as Aldo de Carellis) |
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Giovanni Di Benedetto | ... | Di Brazzi (as John Hawkwood) |
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Valentino Macchi | ... | Policeman |
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Umberto Papiri | ... | Simon |
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Caterina Trentini | ... | Betty Ann (as Katleen Parker) |
| Silvia Dionisio | ... | Margaret (as Sylvia Dionisio) | |
| Lorenza Guerrieri | ... | Wendy | |
| Malisa Longo | ... | Cynthia Fellows | |
| Paola Natale | ... | Maid | |
| Rest of cast listed alphabetically: | |||
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Nando Angelini | ... | Blond Policeman (uncredited) |
Produced by
| Virgilio De Blasi | ... | producer (uncredited) |
| Giuseppe De Blasio | ... | executive producer (uncredited) |
| Lawrence Woolner | ... | producer (uncredited) |
Music by
| Carlo Savina | ||
Cinematography by
| Fausto Zuccoli | ... | director of photography |
Editing by
| Otello Colangeli | ||
Production Design by
| Antonio Visone | ||
Set Decoration by
| Mario Giorsi | ||
Costume Design by
| Mario Giorsi | ||
Makeup Department
| Franca Cotroneo | ... | hair stylist |
| Pierantonio Mecacci | ... | makeup artist (as Piero Mecacci) |
Production Management
| Franco Ciferri | ... | production supervisor |
| Giovanni Masini | ... | production manager (as Nino Masini) |
Second Unit Director or Assistant Director
| Nando Angelini | ... | second assistant director |
| Renato Savino | ... | first assistant director |
Sound Department
| Fausto Achilli | ... | sound mixer |
| Giuseppe Di Liberto | ... | sound engineer |
| Sandro Occhetti | ... | sound mixer |
Camera and Electrical Department
| Giancarlo Ferrando | ... | camera operator |
Editorial Department
| Dante Amatucci | ... | assistant editor |
Music Department
| Don Powell | ... | composer: song "Nightmare" |
| Carlo Savina | ... | composer: song "Nightmare" / conductor |
Script and Continuity Department
| Eva Koltay | ... | script supervisor |
Additional Crew
| Antonio Trapasso | ... | production secretary |
| Mario Bardella | ... | voice dubbing: Giovanna Di Benedetto (uncredited) |
| Roberto Bertea | ... | voice dubbing: Aldo De Carellis (uncredited) |
| Pino Colizzi | ... | voice dubbing: Mark Damon (uncredited) |
| Adalberto Maria Merli | ... | voice dubbing: Franco De Rosa (uncredited) |
| Mirella Pace | ... | voice dubbing: Sally Smith (uncredited) |
| Giorgio Piazza | ... | voice dubbing: Michael Rennie (uncredited) |
