• 
  Sam Newfield

  regizor

• 
  Fred Myton

  scenarist

• 
  George Zucco

  dr. Lloyd Clayton / dr. Elwyn Clayton
• 
  Mary Carlisle

  Gayle Clayton
• 
  Nedrick Young

  dr. David Bentley
• 
  Dwight Frye

  Zolarr
• 
  Fern Emmett

  Kate
• 
  Robert Strange

  Wilkins

• 
  Hal Price
• 
  Sam Flint
• 
  Jimmy Aubrey
• 
  Rube Dalroy
• 
  Frank Matts
• 
  Merrill McCormick
• 
  Milburn Morante

• 
  Rose Plumer
• 
  Al St. John
• 
  Forrest Taylor

• 
  Sigmund Neufeld

  producător
• 
  Jack Greenhalgh

  imagine
• 
  Holbrook N. Todd

  montaj
• 
  Leo Erdody

  coloană sonoră