All Cast
James Donald
Michael Heathley
Phyllis Calvert
Lydia Heathley
Noel Willman
Dr. Dennis Bord
Herbert Lom
Dr. Alex Leon
Robert Beatty
Maj. Sam Seagram
Patric Doonan
Brian Jackson
Walter Fitzgerald
Sir Charles Craddock
Muriel Pavlow
Caroline Cartier
Maurice Denham
Prof. Carrington
Marjorie Fielding
Michael's Mother
Herbert Lomas
George Jackson
Geoffrey Denton
Fisher
Cyril Chamberlain
Inspector Carter
Hal Osmond
Agent Lawson
Caven Watson
Dr. Ferguson
Marianne Stone
Maisie
Stanley Maxted
Prof. Adams
Hartley Power
General Adams (uncredited)
Philip Ray
Sentry (uncredited)
Johnnie Schofield
Jim Barnes (uncredited)