| Person | Type | Job | Role(s) |
|---|---|---|---|
 Antonio Siciliano | Crew | Editing | Editor |
Bruno Di Geronimo | Crew | Writing | Screenplay, Story |
 Bruno Nicolai | Crew | Sound | Music Director |
Clarissa Ambach | Crew | Editing | Editor |
 Edgar Wallace | Crew | Writing | Novel |
 Ennio Morricone | Crew | Sound | Original Music Composer |
 Fulvio Lucisano | Crew | Production | Producer |
 Horst Wendlandt | Crew | Production | Producer |
 Joe D'Amato | Crew | Camera | Director of Photography |
Leo Pescarolo | Crew | Production | Producer |
Luciano Vittori | Crew | Crew | Film Processor |
Luigi Ciccarese | Crew | Camera | Camera Operator |
 Massimo Dallamano | Crew | Writing | Screenplay, Director, Story |
Gastone Carsetti | Crew | Art | Art Direction |
Peter M. Thouet | Crew | Writing | Screenplay |
Dante Trani | Crew | Costume & Make-Up | Makeup Artist |
Luigi Urbani | Crew | Art | Assistant Art Director |
Neil Robinson | Crew | Crew | Dialogue Coach |
Elisa Gut | Crew | Costume & Make-Up | Costume Designer |
Enzo Zocchi | Crew | Lighting | Gaffer |
Giuliano Principato | Crew | Production | Unit Manager |
Giuliano Corso | Crew | Editing | Assistant Editor |
Peter Ruddis | Crew | Sound | Sound |
Francesco Vernier | Crew | Sound | Sound |
Wolfgang Fritsche | Crew | Production | Production Manager |
Enrico Melonari | Crew | Production | Production Manager |
Sesto Salino | Crew | Camera | Key Grip |
 Alfred Vohrer | Cast | Actor | Edgar Wallace (voice) (archive footage) (uncredited) |
 Antonio Anelli | Cast | Actor | Father Herbert |
 Antonio Casale | Cast | Actor | Mr. Newton (as Antony Vernon) |
 Camille Keaton | Cast | Actress | Solange Beauregard |
 Carla Mancini | Cast | Actress | Susan, a Student |
 Charles Howerton | Cast | Actor | Phillip Sullivan (voice) (uncredited) |
 Claudia Butenuth | Cast | Actress | Brenda Pilchard |
 Cristina Galbó | Cast | Actress | Elizabeth Seccles (as Christine Galbo) |
Emilia Wolkowicz | Cast | Ruth Holden (as Emilia Wolkowich) | |
 Fabio Testi | Cast | Actor | Enrico Rosseni |
 Giancarlo Badessi | Cast | Actor | Mr. Erickson |
 Giovanna Di Bernardo | Cast | Actress | Helen Edmonds |
 Günther Stoll | Cast | Actor | Professor Bascombe |
 Joachim Fuchsberger | Cast | Actor | Inspector Barth |
Joe D'Amato | Cast | Actor | CID Officer w / The Daily Telegraph (uncredited) |
John Gayford | Cast | Actor | Joseph Kane (uncredited) |
 Karin Baal | Cast | Actress | Herta Rosseni |
Marco Mariani | Cast | Father Webber | |
 Maria Michi | Cast | Actress | Brenda's Mother (uncredited) |
 Maria Monti | Cast | Actress | Mrs. Erickson |
Pilar Castel | Cast | Actress | Janet Bryant |
 Rainer Penkert | Cast | Actor | Mr. Leach, the Headmaster |
 Vittorio Fanfoni | Cast | Actor | Enrico's Landlord |
 Alfonso Giganti | Cast | Actor | Man at Church (uncredited) |
Joe Wadham | Cast | Actor | Policeman (uncredited) |
Daniele Micheletti | Cast | Mr. Bryant | |
Rory MacDonald | Cast | Phillip Sullivan (uncredited) | |
 Augusta Di Vincenzi | Cast | Actress | Woman in church (uncredited) |
| Person | Type | Job | Role(s) |
