| Cast list | | Michael York | as | Robert Dominici | | Edwige Fenech | as | Hélène Martell | | Donald Pleasence | as | Inspector Datti | | Mapi Galán | as | Susanna | | Fabio Sartor | as | Davide | | Renato Cortesi | as | Agent Marchi | | Antonella Ponziani | as | Gloria Datti | | Carola Stagnaro | as | Dr. Carla Pesenti | | Daniele Brado | as | Dr. Vanni | | Caterina Boratto | as | Robert's Mother | | Lewis E. Ciannelli | as | Chief Physician (as Lewis Eduardo Ciannelli) | | Renata Dal Pozzo | as | Agent Corsi | | Giovanni Lombardo Radice | as | Father Giuliano | | Gianni Franco | as | Inspector | | Marino Masé | as | Expert on aging |
| | Crew list: | | Ruggero Deodato (Director) | | Gianfranco Clerici (Writer) | | Vincenzo Mannino (Writer) |
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