Boris Karloff
Prof. Morlant
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)
Roland Pertwee
Writer
Frank King
Theatre Play
Rupert Downing
Adaptation
T. Hayes Hunter
Director
John Hastings Turner
Writer
Leonard Hines
Theatre Play
Geoffrey Boothby
Unit Manager
Alfred Junge
Art Direction
Peter Birch
Sound Recordist
R. Lyons
Assistant Director
Ian Dalrymple
Editor
Günther Krampf
Director of Photography
Heinrich Heitfeld
Makeup Artist
Ralph Kemplen
Editor
Michael Balcon
Producer
Louis Levy
Original Music Composer