The Mad Ghoul

A university chemistry professor experiments with an ancient Mayan gas on a medical student, turning the would-be surgeon into a murdering ghoul as part of a plan to steal his lover.

• 
  James P. Hogan

• 
  George Zucco
  Dr. Alfred Morris
• 
  David Bruce
  Ted Allison
• 
  Evelyn Ankers
  Isabel Lewis
• 
  Turhan Bey
  Eric Iverson
• 
  Robert Armstrong
  'Scoop' McClure
• 
  Milburn Stone
  Sgt. Macklin
• 
  Addison Richards
  Editor Gavigan
• 
  Rose Hobart
  Della Elliott, reporter
• 
  Andrew Tombes
  Mortician Eagan
• 
  Charles McGraw
  Detective Garrity
• 
  Lillian Cornell
  Isabel's Singing Voice (voice) (uncredited)
• 
  Gus Glassmire
  1st Cemetery Caretaker
• 
  Gene O'Donnell
  Radio Reporter (uncredited)
• 
  Mike Lally
  Reporter (uncredited)
• 
  Chuck Hamilton
  Policeman (uncredited)
• 
  Hans Herbert
  Attendant (uncredited)
• 
  Isabel La Mal
  Maid (uncredited)
• 
  Bess Flowers
  Woman in Audience (uncredited)
• 
  Cyril Ring
  Man in Audience (uncredited)
• 
  Bert Moorhouse
  Man in Audience (uncredited)