Volume 21 (Dark Horse)

Volume 21 is the twenty-first volume of Astro Boy released in the US.

Published by Dark Horse, this reprint collection follows the Tezuka-designed order first used in the Japanese Akita Shoten collections, as opposed to the original Shonen Magazine chronological order used by Kodansha in their Osamu Tezuka Complete Manga Works series.

Chapters

 * Robot Bombs
 * Mission to Mars
 * Sea Serpent Island
 * Frankenstein
 * The Coral Reef Adventure
 * The Test Pilot
 * Super Cyclone