菲利丝·卡沃特

Phyllis Calvert

饰：Lydia Heathley

詹姆斯·唐纳德

James Donald

饰：Prof. Michael Heathley

罗伯特·比提

Robert Beatty

饰：Maj. Sam Seagram

赫伯特·罗姆

Herbert Lom

饰：Dr. Alex Leon

穆瑞尔·帕弗洛

Muriel Pavlow

饰：Caroline Cartier

诺埃尔·威尔曼

Noel Willman

饰：Dr. Dennis Bord

沃尔特·菲茨杰拉德

Walter Fitzgerald

饰：Sir Charles Craddock

Patric Doonan

饰：Brian Jackson

莫瑞斯·德纳姆

Maurice Denham

饰：Prof. Carrington (project director)

Marjorie Fielding

饰：Mother Heathley

Caven Watson

饰：Dr. Ferguson (as Cavan Watson)

Herbert Lomas

饰：George Jackson

Hal Osmond

饰：Agent Lawson

Geoffrey Denton

饰：Fisher

西里尔·张伯伦

Cyril Chamberlain

饰：Police inspector

玛丽安·斯通

Marianne Stone

饰：Whitehall telephone operator

Tucker McGuire

Tucker McGuire

饰：(scenes deleted)

Stanley Maxted

Stanley Maxted

饰：Prof. Adams

John Martin

饰：(uncredited)

哈特利·鲍尔

Hartley Power

饰：(uncredited)

菲利普·雷

Philip Ray

饰：(uncredited)

约翰尼·斯科菲尔德

Johnnie Schofield

饰：Dart player in pub (uncredited)

John Warren

饰：(uncredited)

Douglas Bradley-Smith

Douglas Bradley-Smith

饰：(uncredited)

Patricia Glyn

饰：(uncredited)

John Lorrell

John Lorrell

饰：(uncredited)