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.

• Director: Lambert Hillyer
• Cast: Boris Karloff, Bela Lugosi, Frank Lawton, Frances Drake, Violet Kemble Cooper, Beulah Bondi, Walter Kingsford, Paul Weigel