Astro Boy: Tetsuwan Atom - episode 23 - 13 Sep, 2003

An obsolete artificial satellite, Ashura, goes out of its orbit and begins to fall toward the earth. Thanks to Atom's efforts, catastrophe is averted, but Atom, who was injured while dealing with Ashura, loses his memory and falls into a commune of hermits on the outskirts of Maple Town. At the same time in space, Ganymete, a satellite even bigger than Ashura, was slowly changing its orbit into the Earth's gravitational field. Atom was picked up and saved by a man named Boon, who had once gained fame by developing the all-purpose repair bot, the Boon Unit. Having lost his memory, Atom begins to live in a commune with Boon. (Source: Wikipedia)