| Cast |
| James Franciscus |
Carlo Giordani
|
| Karl Malden |
Franco Arno
|
| Catherine Spaak |
Anna Terzi
|
| Pier Paolo Capponi |
Police Supt. Spini
|
| Horst Frank |
Dr. Braun
|
| Rada Rassimov |
Bianca Merusi
|
| Aldo Reggiani |
Dr. Casoni
|
| Carlo Alighiero |
Dr. Calabresi
|
| Vittorio Congia |
Righetto
|
| Ugo Fangareggi |
Gigi the Loser
|
| Tom Felleghy |
Dr. Esson
|
| Emilio Marchesini |
Dr. Mombelli
|
| Fulvio Mingozzi |
Spimi's man
|
| Corrado Olmi |
Morsella
|
| Pino Patti |
Barber
|
|
| Crew |
| Director |
Dario Argento |
| Director |
Seymour Kneitel |
| Writer |
Dario Argento |
| Writer |
Dardano Sacchetti |
| Producer |
Salvatore Argento |
| Musician |
Ennio Morricone |
| Cinematography |
Erico Menczer |
|
