Directed by
| Ovidio G. Assonitis | ... | (as O. Hellman) |
| Roberto D'Ettorre Piazzoli | ... | (as R. Barrett) |
Writing Credits
| Ovidio G. Assonitis | ... | (story) (as O. Hellman) and |
| Antonio Troiso | ... | (story) |
| Ovidio G. Assonitis | ... | (screenplay) (as O. Hellman) & |
| Antonio Troiso | ... | (screenplay) & |
| Roberto D'Ettorre Piazzoli | ... | (screenplay) (as R. Barrett) |
| Giorgio Marini | ... | (collaborating writer) & |
| Aldo Crudo | ... | (collaborating writer) & |
| Alex Rebar | ... | (collaborating writer) & |
| Christopher Cruise | ... | (collaborating writer) |
| Sonia Molteni | ... | (uncredited) |
Cast (in credits order) verified as complete
| Juliet Mills | ... | Jessica Barrett | |
| Gabriele Lavia | ... | Robert Barrett | |
| Richard Johnson | ... | Dimitri | |
 |
Nino Segurini | ... | Dr. George Staton |
| Elizabeth Turner | ... | Barbara Staton (as Elisabeth Turner) | |
| Barbara Fiorini | ... | Gail Barrett | |
| Carla Mancini | ... | (credit only) | |
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David Colin Jr. | ... | Ken Barrett |
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Vittorio Fanfoni | ... | Mr. Francis |
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Gino Marturano | ... | (as Luigi Marturano) |
| Rest of cast listed alphabetically: | |||
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Joan Acti | ... | (uncredited) |
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Robert Booth | ... | Voice of Demon / Narrator (uncredited) |
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George Montage | ... | Dr. George Staton (uncredited) |
| Edmund Purdom | ... | Devil (uncredited) | |
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Elizabeth Wieseman | ... | Girl at party (uncredited) |
Produced by
| Ovidio G. Assonitis | ... | producer |
| Enzo Doria | ... | producer |
| Edward L. Montoro | ... | producer |
Music by
| Franco Micalizzi | ||
Cinematography by
| Roberto D'Ettorre Piazzoli | ||
Editing by
| Angelo Curi | ||
Art Direction by
| Piero Filippone | ||
| Franco Velchi | ... | (as Franco Pellecchia Velchi) |
Makeup Department
| Giancarlo De Leonardis | ... | hair stylist |
| Alfio Meniconi | ... | makeup assistant |
| Otello Sisi | ... | makeup artist |
Production Management
| Libero Balduini | ... | production manager: Italy |
| Manrico Melchiorre | ... | production manager: USA |
Second Unit Director or Assistant Director
| Luciano Palermo | ... | assistant director: second unit |
| Salavatore Quinn | ... | assistant director |
| Peter Shepherd | ... | first assistant director |
Art Department
| Ettora Mariotti | ... | assistant to art director |
| Giancarlo Stella | ... | assistant to art director |
Sound Department
| Fausto Ancillai | ... | dubbing mixer |
| Roberto Arcangeli | ... | sound effects |
| Bruno Brunacci | ... | sound mixer |
| Fernando Caso | ... | cine audio effects |
| Christopher Cruise | ... | dialogue editor |
| Adolfo Fabrizi | ... | boom operator |
| Alvaro Gramigna | ... | cine audio effects |
| Danilo Sterbini | ... | dubbing mixer |
Special Effects by
| Donn Davison | ... | special effects |
| Wally Gentleman | ... | special effects |
Stunts
| Gino Marturano | ... | stunt performer (uncredited) |
Camera and Electrical Department
| Mario Bagnato | ... | assistant camera |
| Franco Bruni | ... | camera operator |
| Roberto Calabró | ... | still photographer |
| Maurizio Maggi | ... | assistant camera |
| Maurizio Micalizzi | ... | key grip |
| Eugenio Raimondi | ... | chief electrician |
Editorial Department
| Maria Pia Appetito | ... | assistant editor |
| Bruno Sgueglia | ... | assistant editor |
Script and Continuity Department
| Patrizia Zulini | ... | continuity |
Additional Crew
| Riccardo Corti | ... | production secretary |
| Manfredi Marzano | ... | production secretary |
| Edward L. Montoro | ... | presenter |
| Ernesto Poli | ... | production accountant |
| Giorgio Carlo Rossi | ... | presenter |
| Cesare Barbetti | ... | voice dubbing: Gabriele Lavia (uncredited) |
| Laura Boccanera | ... | voice dubbing: Barbara Fiorini (uncredited) |
| Carolyn De Fonseca | ... | voice dubbing (english version) (uncredited) |
| Maria Pia Di Meo | ... | voice dubbing: Juliet Mills (uncredited) |
| Vittoria Febbi | ... | voice dubbing: Elizabeth Turner (uncredited) |
| Nando Gazzolo | ... | voice dubbing: Nino Segurini (uncredited) |
| Sergio Graziani | ... | voice dubbing: Edward L. Montoro (uncredited) |
| Pino Locchi | ... | voice dubbing: Richard Johnson (uncredited) |
| Ted Rusoff | ... | voice dubbing (english version) (uncredited) |
| Lydia Simoneschi | ... | voice dubbing: Joan Acti (uncredited) |
| Pat Starke | ... | voice dubbing (english version) (uncredited) |
