John Harrington

Stephen Forsyth

Helen Wood

Dagmar Lassander

Mildred Harrington

Laura Betti

Inspector Russell (as Jesus Puente)

Jesús Puente

Dr. Kalleway

Gerard Tichy

Alice Norton

Femi Benussi

Vences

Alan Collins

Louise

Antonia Mas

Betsy Wester (as Veronica Llimera)

Verónica Llimerá

John Harrington as a Boy (as Fortunato Pascuale)

Pasquale Fortunato

Jimmy Kane (as José Ignacio Abadaz)

Ignasi Abadal

Vicky

Silvia Lienas

Rosy Miller (as Monserrat Riba)

Montserrat Riba Vidal

Sdenka (archive footage) (uncredited)

Susy Andersen

Unknown (uncredited)

Guido Barlocci

Policeman (uncredited)

Bruno Boschetti

Model (uncredited)

Elina De Witt

Maria (archive footage) (uncredited)

Rika Dialina

Maria (archive footage) (uncredited)

Rika Dialyna

Gorca (archive footage)

Boris Karloff

Giorgio (archive footage) (uncredited)

Glauco Onorato