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.
Boris Karloffas Dr. Janos RukhBela Lugosias Dr. Felix BenetFrank Lawtonas Ronald DrakeFrances Drakeas Diana RukhViolet Kemble Cooperas Mother RukhBeulah Bondias Lady Arabella StevensWalter Kingsfordas Sir Francis StevensPaul Weigelas Monsieur NoyerFrank Reicheras Professor MeiklejohnGeorges Renaventas Chief of the SureteMay Beattyas Mme. LeGrand (uncredited)Paul McAllisteras Papa LaCosta (uncredited)Nydia Westmanas Briggs (uncredited)Ynez Seaburyas Celeste (uncredited)Robert Gravesas Gendarme (uncredited)