Richard Todd
— Edward Mercer
Eva Bartok
— Adriana Medova
John Gregson
— Renzo Uccello
George Coulouris
— Chief of Police Spadoni
Margot Grahame
— Rosa Melitus
Walter Rilla
— Count Boria
John Bailey
— Lieutenant Longo
Sidney James
— Bernardo
Martin Boddey
— Gufo
Michael Balfour
— Moretto
Sydney Tafler
— Boldesca
Miles Malleson
— Grespi
Eric Pohlmann
— Gostini
David Hurst
— Minelli
Raymond Young
— Luigi
Ferdy Mayne
— Tio
Jill Clifford
— Renata
Eileen Way
— Woman Detective
Toni Lucarda
— Nerva
Janice Kane
— Ninetta
Meier Tzelniker
— Mayor of Mirave
Betty E. Box
— Woman Next to the Factory Tour Guide (Uncredited)
Victor Harrington
— Bystander (Uncredited)