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Pluto: Urasawa x Tezuka (stylized in all caps), or simply Pluto, is a Japanese manga series written and illustrated by Naoki Urasawa. It was serialized in Shogakukan's seinen manga magazine Big Comic Original from September 2003 to April 2009, with its chapters collected into eight tankōbon volumes. The series is based on Osamu Tezuka's Astro Boy, specifically "The Greatest Robot on Earth" story arc, and named after the arc's chief villain.