Calificación
Reparto

Barry Jones
Professor John Malcolm Francis Willingdon

André Morell
Superintendent G.W. Folland

Olive Sloane
Goldie Phillips

Sheila Manahan
Ann Willingdon

Hugh Cross
Stephen Lane

Joan Hickson
Mrs. Emily Georgina Peckett

Ronald Adam
Arthur Lytton, the Prime Minister

Marie Ney
Mrs. Willingdon

Joss Ackland
Station Policeman

Marianne Stone
Woman in Phone Box

John Stratton
Army Mechanic