prof. janos rukh ( boris karloff ) discover radium x a powerful force to be use for atomic power . unfortunately rukh have be contaminate by the radium and start to glow in the dark and his touch cause instant death . dr. felix benet ( bela lugosi ) develop an antidote but rukh start to go mad due to the radium and the antidote and set out to kill all he believe wrong him . the plot be silly and the effect that make karloff glow in the dark be laughable and but this be still a fun little chiller . it move quickly and have some great atmosphere ( notice rukh house and the movie start on a dark and rainy night ) and karloff and lugosi ( a always ) give great performance . there be also good acting by franic drake ( a rukh wife ) and violet kemble cooper ( a his mother ) . so it ok but just a notch below all the other karloff or lugosi movie . the plot be just too far fetch for me to swallow . still i do like this . i give it a 7 .