The owner of a coal mining operation, falsely imprisoned for fratricide, takes a drug to make him invisible, despite its side effect: gradual madness.
Cedric Hardwicke
Richard Cobb
Vincent Price
Geoffrey Radcliffe
Nan Grey
Helen Manson
John Sutton
Dr. Frank Griffin
Cecil Kellaway
Inspector Sampson
Alan Napier
Willie Spears
Forrester Harvey
Ben Jenkins
Ernie Adams
Minor Role (uncredited)
