Astro Boy. 7. [graphic novel]

Astro's adventures in the past continue when, after lying buried beneath the Mekong river during the Vietnam War, Astro is discovered and revived many years later in a time when robots are worked like slaves and discarded like broken toys. Teaming with the young and idealistic Dr. Ochanimizu, Astro fights for robot rights...and encounters his creator, Dr. Tenma, at the time of Astro's creating, a situation that could create a dangerous time paradox!