 | Jean Sorel als Dr. George Dumurrier |
 | Marisa Mell als Susan Dumurrier / Monica Weston |
 | Elsa Martinelli als Jane Bleeker |
 | Alberto de Mendoza als Henry Dumurrier |
 | John Ireland als Inspector Wald |
 | Riccardo Cucciolla als Benjamin Wormser |
 | Franco Balducci als Officer Loveday |
 | Bill Vanders als Insurance Agent |
 | Giuseppe Addobbati als Brent |
 | Félix Dafauce als Royal Insurance Official |
 | Jesús Puente als Sergeant Rodriguez |
 | George Rigaud als Arthur Mitchell |
| Jean Sobieski als Larry |
 | Faith Domergue als Marta |
 | Lucio Fulci als Graphologist |
 | Malisa Longo als Elizabeth O'Neill |
 | Geoffrey Copleston als District Attorney |
| Raffaele Mottola als Governor |
 | Bobby Rhodes als Prison Guard |
| Lucio Fulci | Director |
| Roberto Gianviti | Screenplay |
| Giuseppe Banchelli | Makeup Artist |
| Roberto Gianviti | Story |
| Riz Ortolani | Original Music Composer |
| Lucio Fulci | Story |
| Lucia Mirisola | Costume Design |
| Luis Méndez | Production Manager |
| Mario Ligobbi | Sound |
| José Luis Martínez Mollá | Screenplay |
| Iole Cecchini | Hairstylist |
| Lucio Fulci | Screenplay |
| Edmondo Amati | Producer |
| Nedo Azzini | Production Design |
| Pier Luigi Basile | Set Decoration |
| Alejandro Ulloa | Director of Photography |
| Ornella Micheli | Editor |
| Nino Culasso | Musician |
| Paolo Vandini | Production Secretary |
| Giovanni Bergamini | Camera Operator |
| Antonio Benetti | Still Photographer |
| Alessandro Alessandroni | Musician |
| Román Calatayud | Production Design |
| Gino Marinacci | Musician |
| Raffaele Mottola | Dialogue Coach |
| Giovanni Bonivento | Assistant Camera |
| Concetta Pacini | Assistant Editor |
| Alessandro De Santis | Assistant Production Design |
| Massimo Castellani | First Assistant Director |
| Albino Cocco | First Assistant Director |
| Massimo Manasse | Unit Manager |
| Francisco J. Tudela | Unit Manager |
| Vittoria Vigorelli | Script Supervisor |
| Gray Frederickson | Production Assistant |
| Renato Jaboni | Line Producer |
