The Invisible Ray (1936)

Overview: 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.

Starring: Boris Karloff, Bela Lugosi, Frank Lawton, Frances Drake

Categories: Science Fiction, Horror, Thriller