Prof. Morlant
Boris Karloff
Broughton
Cedric Hardwicke
Doctor (uncredited)
George Relph
Laing
Ernest Thesiger
Nigel Hartley
Ralph Richardson
Betty Harlon
Dorothy Hyson
Ralph Morlant
Anthony Bushell
Kaney
Kathleen Harrison
Aga Ben Dragore
Harold Huth
Mahmoud
D.A. Clarke-Smith
Davis the Chauffeur (uncredited)
Jack Raine
Writer
Roland Pertwee
Producer
Michael Balcon
Director
T. Hayes Hunter
John Hastings Turner
Adaptation
Rupert Downing
Theatre Play
Leonard Hines
Frank King
Art Direction
Alfred Junge
Unit Manager
Geoffrey Boothby
Assistant Director
R. Lyons
Sound Recordist
Peter Birch
Original Music Composer
Louis Levy
Editor
Ian Dalrymple
Ralph Kemplen
Makeup Artist
Heinrich Heitfeld
Director of Photography
Günther Krampf