• 
• Arling Alcine
• Detective Sergeant Foray
  

• 
• Don Costello
• Ratkin
  

• 
• Cameron Hall
• Lacey
  

• 
• Mary Heberden
• Probationer
  

• 
• Claude Horton
• Sir John Twining
  

• 
• Charles Jordan
• Duggan
  

• 
• A. P. Kaye
• Chief Inpsector Wentworth
  

• 
• May Marshall
• Sister
  

• 
• Owen Martin
• Lefty Grey
  

• 
• David Orrick
• Dr. Richards
  

• 
• Byron Russell
• George
  

• 
• Bernard Savage
• Constable Mahon
  

• 
• Richard Taber
• Scratch
  

• 
• Harold Thomas
• Attendant
  

• 
• Helen Trenholme
• Janet Kemp
  

• 
• Arthur Vinton
• Mark Ryder
  

• 
• Richard Waring
• Dr. Peter Willens
  

• 
• Guy Beauchamp
• Writer
  

• 
• Michael Pertwee
• Writer
  

• 
• Edward Clarke Lilley
• Staging
  

• 
• Watson Barratt
• Scenic Design
  

• 
• George Bushar
• Producer
  

• 
• John Tuerk
• Producer
  

• 
• William A. Brady
• Produced in Association with