Leonard Sachs

as Group Captain

as Mr. Spratt

as Brouhardier

as Dialogue Scientist at Conference (bit)

as Mr. Charrington

as Bob's Father

as Telegraph Clerk

as Dr. Peterson

as Dr. Poldoi

as Yachtsman (uncredited)

as Sheriff of Nottingham

as German Officer

as Richard Le Gallienne

as Clifton Conrad

as Professor Horvard

as Police Inspector

as Paul Dupont

as Heinrich

as the father

as Richard Warner