Dr. Dana develops a formula which gives him plant-like capabilities. His newly acquired invulnerability provokes the envy of mobster Tony Drago. Drago tries to take the formula form Dana, but is killed.; A pearl is the catalyst for murder, over and over, as greedy men fall victim like dominoes to its allure.; Tourist Robert Morgan travels through Egypt and is lost in a sand storm. He finds refuge in a cave where the noble woman Sandola protects him from a snake and leads him back to the city. Sandola disappears all of a sudden, and Morgan learns that he must have met the ghost of an ancient queen, dead for two thousand years.; A prisoner feeds a rat visiting him in his jail cell. He keeps feeding the animal, because the fatter the rat gets, the more the prison bars are spreading - offering him a chance to escape. One day the prisoner is given no food - and the rat feeds on him.; Arctic explorers find a mountain out of uranium ore, but the radiation changes them into monstrous fiends.