"Captain Atom" is a science fiction Manga whose theme is the coexistence and conflict between humans and aliens from another planet. The character "Atom" made his debut in this work. The setting is the future Earth. 
One day, a large number of aliens from "another Earth" descend to the Earth. This "other Earth" was exactly the same as the Earth had been in the past: it had Japan, the United States and other countries where creatures just like human beings lived. But the "other Earth" was completely destroyed by an explosion and its former inhabitants have since been wandering in space for thousands of years aboard a spaceship. 
At first, Earthlings welcome the aliens from the other Earth, but they soon begin to fight when the Earth is severely hit by famine. Alien hunting becomes rampant, and humans and aliens face a crisis of a full-scale war. Then comes ATom, a humanoid robot. Atom visits the spaceship alone to negotiate with the aliens. Will he succeed?

 
(Source: tezukaosamu.net)

In the distant year 2003, Japan is a technological utopia, and robots are everywhere. One such robot, Tobio, was built by the brilliant Dr. Tenma to replace his dead son. But when it soon becomes apparent that Tobio is an imperfect copy of his departed child, Dr. Tenma throws him out. He is rescued from the scrap heap by the benevolent Professor Ochanomizu, a crusader for robot civil rights. Now the little robot, renamed Astro Boy, is given a mission to defend Japan and the world from all manner of sinister threats. Using his seven super-abilities and 100,000 horsepower worth of strength to battle evil, Astro hopes to set an example to the world of the good which all robots are capable of. 

Note: Chapter count only includes chapters from the original 1952 to 1968 serial

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