James Franciscus ( James Franciscus )

Carlo Giordani

Karl Malden ( Karl Malden )

Franco Arnò

Catherine Spaak ( Catherine Spaak )

Anna Terzi

Pier Paolo Capponi ( Pier Paolo Capponi )

Police Supt. Spini

Horst Frank ( Horst Frank )

Dr. Braun

Rada Rassimov ( Rada Rassimov )

Bianca Merusi

Aldo Reggiani ( Aldo Reggiani )

Dr. Casoni

Carlo Alighiero ( Carlo Alighiero )

Dr. Calabresi

Vittorio Congia ( Vittorio Congia )

Righetto (cameraman)

Ugo Fangareggi ( Ugo Fangareggi )

Gigi the Loser

Tom Felleghy ( Tom Felleghy )

Dr. Esson

Emilio Marchesini ( Emilio Marchesini )

Dr. Mombelli

Fulvio Mingozzi ( Fulvio Mingozzi )

Spimi's man

Corrado Olmi ( Corrado Olmi )

Morsella

Pino Patti ( Pino Patti )

Barber

Umberto Raho ( Umberto Raho )

Manuel's ex-lover

Jacques Stany ( Jacques Stany )

Prof. Manera

Stefano Oppedisano ( Stefano Oppedisano )

Taxi driver

Ada Pometti ( Ada Pometti )

Telephone operator

Walter Pinelli ( Walter Pinelli )

Sascha Helwin ( Sascha Helwin )

Marie Louise Sinclair ( Marie Louise Sinclair )

Film starlet

Martial Boschero ( Martial Boschero )

Cinzia De Carolis ( Cinzia De Carolis )

Lori

Werner Pochath ( Werner Pochath )

Manuel

Tino Carraro ( Tino Carraro )

Prof. Fulvio Terzi

Ettore Arena ( Ettore Arena )

Billiard Player (uncredited)

Aristide Caporale ( Aristide Caporale )

Smoker in the Billiard Hall (uncredited)

Giovanni Di Benedetto ( Giovanni Di Benedetto )

Chief of Police Salmi (uncredited)

Margherita Horowitz ( Margherita Horowitz )

Lori's Babysitter (uncredited)

Giuseppe Marrocco ( Giuseppe Marrocco )

Man at Table in the Saint Peter's Club (uncredited)

Gennarino Pappagalli ( Gennarino Pappagalli )

Man in the Terzi's Institute (uncredited)

Aldo Parenti ( Aldo Parenti )

(uncredited)

Franco Ukmar ( Franco Ukmar )

Policeman - Speaks with Morsella About Food (uncredited)