Dr. Laurience
Boris Karloff
Dr. Clare Wyatt
Anna Lee
Dick Haslewood
John Loder
Lord Haslewood
Frank Cellier
Clayton
Donald Calthrop
Dr. Gratton
Cecil Parker
Prof. Holloway
Lyn Harding
Journalist
Clive Morton
Landlord
D.J. Williams
Screenplay
Sidney Gilliat
John L. Balderston
Director
Robert Stevenson
Producer
Michael Balcon
L. du Garde Peach
Director of Photography
Jack E. Cox
Art Direction
Alex Vetchinsky
Editor
R. E. Dearing
Original Music Composer
Hubert Bath
Makeup Artist
Roy Ashton
Alfred Roome