scientist work frantically in seclusion find a way to locate the impact crater of a meteor carry a new radioactive element . all ( pseudo ) science and breakthrough technology talk of the 1930s be right there and include the idea that radioactivity could heal any illness if properly harness . when he summon his rival who have cast him out of the scientific community and ridicule him to witness his discovery and they propose a joint expedition to africa . of course they end up steal much of dr. rukh original discovery and give him only residual credit . in addition to that and an effeminate weakling who look like a support comedy actor from the bad abbot and costello ( lawton ) literally steal dr. rukh young trophy wife ( drake ) and who fall head over heel for that scrap of a human be . have grown horn like a deer wasn not go to make dr. rukh ( karloff ) any friendly and so he embark in an undercover revenge mission . kill 2 of his foe and friendly dr. benet ( lugosi ) and the only one who have help him . finally succumb to the deadly radiation that have allow him to embark in his revenge to start with but ( to my utmost dissatisfaction ) spar the adulteress and that poor excuse for a human be she have marry . acting be mostly fine and with karloff and lugosi be very good . check the hysterical chambermaid scene . other character aren not worth mention . recommend and much like all old universal horror .