In the year 2000, robots are commonplace and in many cases, have replaced human beings in the workplace and in other roles. Dr. Tenma used to be the jovial head of the Institute of Science; but once his son Tobio was killed in a tragic accident, he turned his attention to building a robot to replace his loved one. Named Astro Boy, Tobio's replacement was intelligent and thoughtful; yet he didn’t age, and ultimately Dr. Tenma resented his creation and sold him to a cruel circus manager. Luckily for Astro, he was soon liberated by the current head of the Institute of Science and given a new life. In addition to learning how to become a better "person," Astro uses his nerves of steel and superhuman strength to put a stop to evildoers and withhold justice for all!
On the planet Radion, representatives from many worlds have gathered to make a choice: do they allow Earth, who still believes they are the only intelligent life in the universe, to join the Galactic Union of Worlds? Many are skeptical, so a plan has been devised: Prince Planet, a Universal Peace Corps member, will travel to Earth; and disguised as a normal boy, he will help fight evil and injustice and help instill a sense of peace with the Earthlings! Alongside trusty friends, Prince Planet uses the power of his pendant for the greater good!
Prince Planet and Astroboy (1963) are two peas in a pod. Not only do they come from the same era, but each involves an unlikely hero who battles villains for truth and justice. The mood and feel, level of campy-ness and overall stories are fairly dead on. Try out one if you liked the other.