Alfred Wellesley	Undetermined Role
Antonia Brough	Undetermined Role
Ben Welden	San Francisco Reporter
Bernard Nedell	San Francisco Reporter
Bruce Winston	Mr. Cox
Edward Chapman	Major Grigsby
Ernest Sefton	Reporter
Ernest Thesiger	Maydig
George Sanders	Indifference
Gertrude Musgrove	Effie (replaced by Joan Hickson)

Ivan Brandt	Player
Jane Baxter	Customer
Joan Gardner	Ada Price
Joan Hickson	Effie
Lawrence Hanray	Mr. Bamfylde
Mark Daly	Toddy Beamish
Michael Rennie	San Francisco Cop
Nigel Stock	Office Boy
Olga Edwardes	Undetermined Role
Ralph Richardson	Colonel Winstanley
Robert Cochran	Bill Stoker
Roland Young	George McWhirter Fotheringay
Sophie Stewart	Maggie Hooper
Torin Thatcher	Observer
Wallace Lupino	Constable Winch
Wally Patch	Supt. Smithells

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A csodálatos emberi agy