| Actor | Gabriele Lavia (as Stefano), Cesare Barbetti (as Dr. Meyer), Bob Tonelli (as Mr. Big), Ferdinando Orlandi (as Giovine - Faux Don Luigi ), Enea Ferrario (as Mirko), John Stacy (as Professor Chesi ), Alex Partexano (as Police Lt. Guido Silvestri), Marcello Tusco (as Dr. Melis), Aldo Sassi (as Don Mario), Enrico Ardizzone (as Benni), Andrea Montuschi (as Inspector Bouffet ), Adolfo Belletti (as Don Emidio), Paolo Bacchi (as Mr. Big's Secretary), Carlo Schincaglia (as Cemetery Guardian), Gianluigi Gaspari, Pino Tosca, Giovanni Brusadori, Sergio Lama, Giuseppe Lentini, Giancarlo Bandini |
| Actress | Anne Canovas (as Alessandra), Paola Tanziani (as Gabriella Goodman ), Veronica Moriconi (as Young Gabriella), Maria Teresa Tofano (as Anna), Pina Borione (as Helena, the 1st victim), Imelde Marani (as Nurse) |
| Cinematography By | Franco Delli Colli |
| Co-Producer | Enea Ferrario |
| Director, Story, Screenplay | Pupi Avati |
| Film Editing By | Amedeo Salfa |
| Music By | Riz Ortolani |
| Producer | Antonio Avati, Gianni Minervini |
| Production Design By | Giancarlo Basili, Leonardo Scarpa |
| Screenplay | Maurizio Costanzo, Antonio Avati |
| Voice | Frank von Kuegelgen (as Stefano) |
