George Archibald Potts
George Cole
Zekov
Oskar Homolka
Barworth Controller
Ronald Adam
Barworth Superintendent
Edwin Styles
Barworth Director
Kynaston Reeves
Professor Layton
Ernest Jay
Smedley
Michael Medwin
Minister of Health
Henry Hewitt
1st Cabinet Minister
Walter Horsbrugh
2nd Cabinet Minister
Anthony Shaw
1st Reporter
Tim Turner
Schoolmaster
Gibb McLaughlin
Tania
Nadia Gray
Jersey Sailor
Michael Balfour
Jersey Waiter
Hal Osmond
Gaston
Charles Goldner
Aubrey
Ronnie Stevens
Cecilia
Eleanor Summerfield
Mrs. Tweedy
Phyllis Morris
Jersey Air Hostess
Myrtle Reed
Madame
Ina De La Haye
Deutsch
David Hurst
Trubiev
Bernard Rebel
Sir Hubert Wells
Wilfrid Hyde-White
Roblettski
Olaf Pooley
1st M.V.D.
Guido Lorraine
2nd M.V.D.
Terence Alexander
Russian Sentry
Richard Marner
Russian Security Officer
Martin Boddey
Russian Director of Plant
Gerard Heinz
Russian Doctor
Fred Berger
British N.C.O.
Victor Maddern
1st U.S. Soldier
Reed De Rouen
2nd U.S. Soldier
Johnny Catcher
Barnes
Richard Wattis
British Officer
Willoughby Gray
Border Police GDR (uncredited)
Anton Diffring
Mrs. Tidmarsh
Irene Handl
Russian Agent (uncredited)
Christopher Lee
Prime Minister
Frederick Leister
Rakov
Frederick Valk
Pike
Geoffrey Sumner
Original Music Composer
Stanley Black
Director
Mario Zampi
Producer
Screenplay
Michael Pertwee
Jack Davies
Director of Photography
Stanley Pavey
Art Direction
Ivan King
Editor
Giulio Zampi