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.

Directed by: Lambert Hillyer
Written by: John Colton
Runtime: 79 minutes
Critics score:
Tagline: Delving into new, strange fields of mystery!
Cast:
Boris Karloff Boris Karloff
Dr. Janos Rukh 
Bela Lugosi Bela Lugosi
Dr. Felix Benet 
Frank Lawton Frank Lawton
Ronald Drake 
Frances Drake Frances Drake
Diana Rukh 
Violet Kemble Cooper Violet Kemble Cooper
Mother Rukh 
Beulah Bondi Beulah Bondi
Lady Arabella Stevens 
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Also known as:
  • El rayo invisible