Calificación
Reparto
George Cole
George Archibald Potts
Oskar Homolka
Zekov
Nadia Gray
Tania
Wilfrid Hyde-White
Sir Hubert Wells
Richard Wattis
Barnes
Irene Handl
Mrs. Tidmarsh
Christopher Lee
Russian Agent (uncredited)
Frederick Leister
Prime Minister
Frederick Valk
Rakov
Geoffrey Sumner
Pike
Ronald Adam
Barworth Controller
Edwin Styles
Barworth Superintendent
Kynaston Reeves
Barworth Director
Ernest Jay
Professor Layton
Michael Medwin
Smedley
Henry Hewitt
Minister of Health
