The Invisible Ray (1936 film)

The Invisible Ray is a 1936 American science fiction film starring Boris Karloff credited as KARLOFF and Bla Lugosi as Dr. Felix Benet that was released by Universal Pictures.

The situation is complicated by the romantic relationship between his wife, Diana Frances Drake, and Ronald Drake Frank Lawton, the nephew of Lady Arabella Stevens Beulah Bondi, who was part of the African expedition. Crazed with a desire for revenge, Rukh follows his enemies to Paris. There he fakes his own death, upon which Ronald and Diana marry. Rukh then uses the toxic radiation poisoning imparted to him by Radium X exposure to kill off the members of the expedition. He saves Ronald and Diana for last, but finds himself unable to kill his wife.Rukhs hesitation brings him close to the point where the radiation poisoning will become fatal to himself. He had been able to stave off the terminal stage by taking the antidote developed by Dr. Benet, but Rukhs mother who had foreseen her sons undoing and had her own blindness healed by the meteor smashes the antidote bottle. At this point, Rukh bursts into flames as he jumps out a window. ........

Source: Wikipedia