Al Cliver
— Michael Teague
Carole André
— Nicky Stone
Claudine Auger
— Maggie Vanderberg
William Berger
— Mackenzie
Francesco Casaretti
Frank Derosa
— Nick
Tony Di Mitri
— Dr. Alfred Houseman
Mariangela Giordano
— Sandro's lover
Edmund Purdom
— Professor Vanderberg
Gabriele Tinti
— Sandro Vincenzoni
Fausto Tozzi
— Mark Lemmon