The Invisible Ray

Dr. Janos Rukh discovers a certain type of radium that has almost magical healing properties. But the element has a dangerous side, too, and it has already started affecting Rukh. Consumed by paranoia, he begins to suspect that his wife is having an affair. Wild for revenge, Rukh hatches a deadly plot...using his own poisoned body as a weapon to kill.

• 
  Boris Karloff

  Dr. Janos Rukh
• 
  Bela Lugosi

  Dr. Felix Benet
• 
  Frank Lawton

  Ronald Drake
• 
  Frances Drake

  Diana Rukh
• 
  Violet Kemble Cooper

  Mother Rukh
• 
  Beulah Bondi

  Lady Arabella Stevens
• 
  Walter Kingsford

  Sir Francis Stevens
• 
  Paul Weigel

  Monsieur Noyer
• 
  Frank Reicher

  Professor Meiklejohn
• 
  Georges Renavent

  Chief of the Surete