Claudio Brook

as Robert Foster

Daniela Bianchi

as Arabella

Sydney Chaplin

as Inspector Chandler

Jess Hahn

as Boris

Yves Vincent

as Felton

Paolo Gozlino

as Gordon Smash

Stefania Careddu

as Katia

Nazzareno Zamperla

as Flash

Jacques Herlin

as Actor at recital

Anthony Dawson

as Dr. Evans

Harriet Medin

as Dr. Evans' assistant

Andrea Bosic

as Diplomat

Juma González

Raymond Bussières

as Train conductor

Tina Aumont

as Dolly

Claudio Biava

George Wang

as Chang

Guido Lollobrigida

Gino Turini

Aldo Cecconi

Roberto Simmi

Valentino Macchi

Pietro Ceccarelli

as Gang Member

Pietro Torrisi

Claudio Ruffini

Goffredo Unger

John Bartha

as Hotel Detective (uncredited)

Bruno Bertocci

as Uomo in radazione (uncredited)

Harold Bradley

Vittorio Cramer

as Voce della radio (uncredited)

Mario Ingrassia

as Policeman (uncredited)

John Karlsen

as Photographer in Nightclub (uncredited)

Bill Vanders

as Newspaper Editor (uncredited)