The Invisible Ray is an exciting story about an overworked scientist who works effortlessly in his Carpathian castle looking for secrets of the universe. Boris Karloff plays the scientist Janos Ruhk who travels with a band of other scientists to Africa for the spot where an unidentified element landed centuries ago. Karloff is very good as the scientist who accidentally poisons himself with this new radioactive element. Karloff is obsessed with the idea that his fellow travelers, amongst them the stately Lugosi as Dr. Benet, are after his honors and secrets of this new find. Because of this, Karloff goes on a maniacal murdering spree of his former friends. There are many good elements in this film, most dealing with the rather interesting story of science gone amok. Lugosi is good too, although his role is not very big. I must agree with many that this pairing of the horrific duo is a second to The Black Cat. Nonetheless this is a fine Universal science fiction/horror film.