From time to time, the civilized world is shocked to hear of the sightings of various and assorted monsters: the Loch Ness Monster of Scotland, the Mediterranean colocynth - a prehistoric fish actually caught in the late 1950s, etc.
Robots are now mass produced, so when Astro Boy wants a mom, Elefun has a mom and dad made for him. A colossal robot short-circuits and helps bank robbers. Only Astro Boy can stop it.
Princess Lollipop flees Hullabaloo Land. Astro Boy tries to help but she's forced back. He visits Hullabaloo Land with Elefun. It only appears to be an amusement park.
Cross Island is a mysterious uncharted island in a little-known sea. Here, a task force of robots work in great secrecy, extracting valuable stores of uranium.
A robot named Astro Boy is built. He replaces Dr. Boynton's dead son. Realizing he's not a real boy, Dr. Boynton sells him to the circus. After saving the circus owner's life, Astro Boy gets his freedom and Elefun as mentor.
One night, during a storm, Astro Boy meets Lodar, a boy from another planet. Lodar has come to warn us of an invasion of flying saucers from his world.