Release of the Earth

Astro Boy is blown away by an explosion. When he visits Dr. Elefun, the doctor says that he has never met him. He is actually in Parallel World, which greatly resembles Astro Boy's own world but where the people are under the rule of metal men from outer space. He gains the assistance of Bearded Grandpa, Dr. Tenba and his son Tonio in returning the Earth to the humans.