The Invisible Ray

Synopsis

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

May Beatty

Mme. LeGrand (uncredited)

Paul McAllister

Papa LaCosta (uncredited)