Onder andere met: Michael York (Robert Dominici), Edwige Fenech (Hélène Martell), Donald Pleasence (Inspector Datti), Mapi Galán (Susanna), Fabio Sartor (Davide), Renato Cortesi (Agent Marchi), Antonella Ponziani (Gloria Datti), Carola Stagnaro (Dr. Carla Pesenti), Daniele Brado (Dr. Vanni), Caterina Boratto (Robert's Mother), Lewis E. Ciannelli (Chief Physician), Renata Dal Pozzo (Agent Corsi), Giovanni Lombardo Radice (Father Giuliano), Gianni Franco (Inspector), Marino Masé (Expert on aging)