Boris Karloff
James Rankin
Elizabeth Allan
Barbara Rankin
Tim Turner
Dr. Kenneth McColl
Max Brimmell
Newgate Prison Turnkey
Leslie Perrins
Newgate Prison Governor
Jessica Cairns
Asylum Maid
Desmond Roberts
Dr. Johnson
Roy Russell
Medical Superintendent
Derek Birch
Guyse Hospital Superintendent
Audrey Sykes
Laughing Lady at Hanging (uncredited)
Marie Devereux
Show Girl (uncredited)