On screen
Cast
12 credited performers
Boris Karloff
Dr. Laurence
Anna Lee
Dr. Clare Wyatt
John Loder
Dick Haslewood
Frank Cellier
Lord Haslewood
Donald Calthrop
Clayton
Cecil Parker
Dr. Gratton
Lyn Harding
Prof. Holloway
Clive Morton
Journalist
Artwork unavailable
D.J. Williams
Landlord
Artwork unavailable
Vincent Holman
Mr. Gray
Artwork unavailable
Charles Rolfe
Police Constable
Artwork unavailable
Bryan Powley
Character not listed