• 
  Chester Morris

  Horatio 'Boston Blackie' Black
• 
  Charles C. Wilson

  Police Lieutenant
• 
  Joseph Crehan

  'Jumbo' Madigan - Pawnbroker
• 
  Wilton Graff

  Rex Duncan
• 
  Jeff Donnell

  Anne Parks Duncan
• 
  Edmund Cobb

  Poliţist
• 
  Murray Alper

  Eddie Alexander, Chauffeur
• 
  George E. Stone

  The Runt

• 
  Forbes Murray

  Dr. Purcell Nash
• 
  Eddie Fetherston

  Second Police Sergeant
• 
  Frank Sully

  Detective Sergeant Matthews
• 
  Eddie Dunn

  Sergent de poliţie
• 
  Dusty Anderson

  Sandra
• 
  Richard Lane

  Inspector John Farraday
• 
  Marvin Miller (I)

  Dr. Nejino

• 
  Robert Peterson (I)

  art director
• 
  Al Clark

  montaj
• 
  Ernst Toch

  music department
• 
  Marlin Skiles

  music department
• 
  Irving Gertz

  music department
• 
  Friedrich Hollaender

  music department
• 
  George Montgomery (II)

  set decorator