Barry Jones
Professor John Malcolm Francis Willingdon
Acting
André Morell
Superintendent G.W. Folland
Acting
Olive Sloane
Goldie Phillips
Acting
Sheila Manahan
Ann Willingdon
Acting
Hugh Cross
Stephen Lane
Acting
Joan Hickson
Mrs. Emily Georgina Peckett
Acting
Ronald Adam
Arthur Lytton, the Prime Minister
Acting
Marie Ney
Mrs. Willingdon
Acting
Joss Ackland
Station Policeman
Acting
Marianne Stone
Woman in Phone Box
Acting
John Stratton
Army Mechanic
Acting
George Spence
Man on Bus (uncredited)
Acting