Mr. Sardonicus

In 1880, Sir Robert Cargrave, a London physician known for his experimental work in paralysis treatment, is summoned to Gorslava by the mysterious Baron Sardonicus—who is now married to Cargrave's former wife, Maude—to treat his disfigurement. When Cargrave arrives, he finds the masked baron is a cruel sadist who has threatened to harm Maude if he is not successfully cured.

• 
  William Castle
• 
  R. Robert Rosenbaum

• 
  Ronald Lewis
  Sir Robert Cargrave
• 
  Audrey Dalton
  Maude Sardonicus
• 
  Guy Rolfe
  Baron Sardonicus
• 
  Oskar Homolka
  Krull
• 
  Vladimir Sokoloff
  Henryk Toleslawski
• 
  Erika Peters
  Elenka
• 
  Lorna Hanson
  Anna
• 
  Constance Cavendish
  Mrs. Higgins (uncredited)
• 
  James Forrest
  Geoffery Wainwright (uncredited)
• 
  Tina Woodward
  The Girl (uncredited)
• 
  Mavis Neal Palmer
  Head Nurse (uncredited)
• 
  Charles H. Radilak
  Stationmaster (uncredited)
• 
  David Janti
  Janku (uncredited)
• 
  Franz Roehn
  Gravedigger (uncredited)
• 
  Annalena Lund
  First Girl (uncredited)
• 
  Ilse Burkert
  Second Girl (uncredited)
• 
  William Castle
  Self (uncredited)