The Invisible Ray 1936

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.

Cast:

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 

• El rayo invisible