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

Walter Horsbrugh

1st Cabinet Minister

Anthony Shaw

2nd Cabinet Minister

Tim Turner

1st Reporter

Gibb McLaughlin

Schoolmaster

Michael Balfour

Jersey Sailor

Hal Osmond

Jersey Waiter

Charles Goldner

Gaston

Ronnie Stevens

Aubrey

Eleanor Summerfield

Cecilia

Phyllis Morris

Mrs. Tweedy

Myrtle Reed

Jersey Air Hostess

Ina De La Haye

Madame

David Hurst

Deutsch

Bernard Rebel

Trubiev

Olaf Pooley

Roblettski

Guido Lorraine

1st M.V.D.

Terence Alexander

2nd M.V.D.

Richard Marner

Russian Sentry

Martin Boddey

Russian Security Officer

Gerard Heinz

Russian Director of Plant

Fred Berger

Russian Doctor

Victor Maddern

British N.C.O.

Reed De Rouen

1st U.S. Soldier

Johnny Catcher

2nd U.S. Soldier

Willoughby Gray

British Officer

Anton Diffring

Border Police GDR (uncredited)