Dr. John Garth conducting an innovative medical experiment aimed at prolonging life and combating aging. The experiment takes an unexpected turn, placing the doctor in a confrontation with the ethics of his work and the consequences of his research.
Boris Karloff
as Dr. John Garth
Evelyn Keyes
as Martha Garth
Bruce Bennett
as Dr. Paul Ames
Don Beddoe
as Capt. McGraw
Edward Van Sloan
as Dr. Ralph Howard
Ben Taggart
as Warden Thompson
Pedro de Cordoba
as Victor Sondini
Wright Kramer
as George Wharton
Bertram Marburgh
as Stephen Barclay
Robert Fiske
as District Attorney
Frank Richards
as Otto Kron - Convict
Kenneth MacDonald
as Anson, Prison Guard
