The story takes place in Metro City, circa 2000 A.D. After the death of his son, Dr. Tenma (Dr. Boynton) copes with his grief by creating a robot child that looks like his son: Astro Boy. After some time it becomes clear that Astro is not like Tobi, so his father sells him to Hamegg (Cacciatore), the cruel ringmaster of a robotic circus. At the circus, Astro is forced to fight against Z.O.G. and wins after he discovers some of his abilities. Professor Ochanomizu (Dr. Elefun) protests the abuse of robots and unsuccessfully negotiates for Astro's release. Later that night, Astro revives some robotics that Hamegg plans to sell as scrap metal. Later a robot named Sparky explodes, causing the whole circus tent to collapse. Astro leads the robots in a rescue mission. Later at a hospital, Astro is liberated from Hamegg as Professor Ochanomizu leaves with him.