In the far reaches of outer space, on a distant world known only as Planet-X, lives a race of beings, so highly advanced, they have successfully merged man and machine into one. They call themselves Humatrons, and on Planet-X, every Humatron is created with meaning, and purpose. Under the rule of the Robot King, society functions to absolute perfection. But when his daughter, the Robot Princess mysteriously vanishes, the king enlists the help of his most trusted servant, the Space Ranger, to bring her back safe and sound.