| Jessica Harper | Suzy Bannion |
| Stefania Casini | Sara |
| Flavio Bucci | Daniel |
| Miguel Bosé | Mark |
| Barbara Magnolfi | Olga |
| Susanna Javicoli | Sonia |
| Eva Axén | Pat Hingle |
| Rudolf Schündler | Prof. Milius |
| Udo Kier | Dr. Frank Mandel |
| Alida Valli | Miss Tanner |
| Director | Dario Argento |
| Producer | Claudio Argento; Salvatore Argento |
| Writer | Thomas De Quincey; Dario Argento |
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