Rukh finds the meteorite, but is exposed to its unknown radiation, now dubbed "Radium X". This causes him to glow in the dark and to make his mere touch instantaneous deadly to any living thing. The exposure also begins to warp his mind. Returning to the base camp, he entreats Dr. Benet to devise a means of neutralizing Radium X's poisoning effect. Benet develops a serum that holds the lethal element's toxicity at bay, but Rukh must take regular doses of the antidote or he will revert to being a luminous killing machine. Rukh returns to his jungle base and learns from Benet that this situation has been complicated by the romantic relationship between Rukh's wife, Diana (Frances Drake), and Ronald Drake (Frank Lawton), the nephew of Lady Arabella Stevens (Beulah Bondi), Dr. Stevens' wife.