Reparto principal

Ultimátum reparto completo

Un científico amenaza con detonar una bomba atómica si el gobierno no anuncia el final de cualquier investigación en este campo dentro de una semana.

Reparto principal

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Barry Jones

Professor John Malcolm Francis Willingdon

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André Morell

Superintendent G.W. Folland

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Olive Sloane

Goldie Phillips

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Sheila Manahan

Ann Willingdon

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Hugh Cross

Stephen Lane

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Joan Hickson

Mrs. Emily Georgina Peckett

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Ronald Adam

Arthur Lytton, the Prime Minister

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Marie Ney

Mrs. Willingdon

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Joss Ackland

Station Policeman

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Marianne Stone

Woman in Phone Box

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John Stratton

Army Mechanic

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George Spence

Man on Bus (uncredited)

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