
James Donald
Michael Heathley
Acting

Phyllis Calvert
Lydia Heathley
Acting

Noel Willman
Dr. Dennis Bord
Acting

Herbert Lom
Dr. Alex Leon
Acting

Robert Beatty
Maj. Sam Seagram
Acting

Patric Doonan
Brian Jackson
Acting

Walter Fitzgerald
Sir Charles Craddock
Acting

Muriel Pavlow
Caroline Cartier
Acting

Maurice Denham
Prof. Carrington
Acting

Marjorie Fielding
Michael's Mother
Acting

Herbert Lomas
George Jackson
Acting
![Geoffrey Denton]()
Geoffrey Denton
Fisher
Acting

Cyril Chamberlain
Inspector Carter
Acting

Hal Osmond
Agent Lawson
Acting
![Caven Watson]()
Caven Watson
Dr. Ferguson
Acting

Marianne Stone
Maisie
Acting

Stanley Maxted
Prof. Adams
Acting

Hartley Power
General Adams (uncredited)
Acting

Philip Ray
Sentry (uncredited)
Acting

Johnnie Schofield
Jim Barnes (uncredited)
Acting
![John Warren]()
John Warren
Ted (uncredited)
Acting