Howard Duff

Dr. Stephen Mitchell

Eva Bartok

Dr. Lisa Frank

Alan Wheatley

Dr. Smith

Philip Leaver

Professor Koepler

Michael Medwin

Dr. Toby Andrews

Andrew Osborn

Dr. Philip Crenshaw

Cecile Chevreau

Vanessa Mitchell

Anthony Ireland

General Hayes

Hugh Moxey

Colonel Alfred Daniels

David Horne

Minister

Leo Phillips

Sergeant Peterson (uncredited)

Marianne Stone

Mrs. Rogers (uncredited)

Jean Webster-Brough

Mrs. Daniels (uncredited)

Terence Fisher