Klaus Kinski

John Alexander

Christiane Krüger

Christine

Günther Stoll

Inspektor Steevens

Annabella Incontrera

Liz

Margaret Lee

Helen Alexander

Sydney Chaplin

Mr.Brown

Barbara Nelli

Alice

Ignazio Dolce

Carlo Marcolino

Servant

Gastone Pescucci

Peter

Luciano Spadoni

Inspector Gordon

Claudio Trionfi

Bedy Moratti

(uncredited)

Fulvio Pellegrino

Policeman (uncredited)

Domenico Ravenna

Spectator at horse race (uncredited)

Alfred Vohrer

Edgar Wallace (voice) (archive footage) (uncredited)

Alice Arno

(hardcore inserts - French 1976 version)