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

Renata Dal Pozzo as Agent Corsi

Giovanni Lombardo Radice as Father Giuliano

Gianni Franco as Inspector

Marino Masé as Aging Expert

Achille Brugnini as

Giovanni Tamberi as Andrea

Loris Loddi as Danzil, a Cop

Hal Yamanouchi as Swordmaster

Diego Verdegiglio as

Raffaella Baracchi as Laura, Venice Prostitute

Emy Valentino as

Daniela Merlo as Mother (uncredited)

Raf Baldassarre as Man in Police Line-Up (uncredited)

Rossana Canghiari as Party Guest (uncredited)

Lella Cattaneo as Woman at Robert's Piano Concert (uncredited)

Ruggero Deodato as Man That Gets on Moped at Station (uncredited)

Giuseppe Marrocco as Man at Robert's Piano Concert (uncredited)

Benito Stefanelli as Man in Restroom (uncredited)