Michael Heathley

James Donald

Acting

Lydia Heathley

Phyllis Calvert

Acting

Dr. Dennis Bord

Noel Willman

Acting

Dr. Alex Leon

Herbert Lom

Acting

Maj. Sam Seagram

Robert Beatty

Acting

Brian Jackson

Patric Doonan

Acting

Sir Charles Craddock

Walter Fitzgerald

Acting

Caroline Cartier

Muriel Pavlow

Acting

Prof. Carrington

Maurice Denham

Acting

Michael's Mother

Marjorie Fielding

Acting

George Jackson

Herbert Lomas

Acting

Fisher

Geoffrey Denton

Acting

Inspector Carter

Cyril Chamberlain

Acting

Agent Lawson

Hal Osmond

Acting

Dr. Ferguson

Caven Watson

Acting

Maisie

Marianne Stone

Acting

Prof. Adams

Stanley Maxted

Acting

General Adams (uncredited)

Hartley Power

Acting

Sentry (uncredited)

Philip Ray

Acting

Jim Barnes (uncredited)

Johnnie Schofield

Acting

Ted (uncredited)

John Warren

Acting