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