Boris Karloff, by means of his time and space travel machine, is able to pinpoint a meteor that landed in Africa. With the help of fellow scientist Bela Lugosi, Karloff puts together an expedition to retrieve the meteor, which contains "Radium X," a substance more powerful than radium.
Upon finding the meteor, Karloff is contaminated by radiation and discovers that he kills whatever he touches. Lugosi comes up with a short-term antidote, but the radiation is making Karloff go mad. Thinking that Lugosi and others from the expedition have cheated him out of the limelight by
presenting the meteor to the Scientific Congress, Karloff kills them and almost kills his wife...