Tetsuwan Atom - episode 100 - 25 Dec, 1964

On Christmas night, Dr. Ochanomizu opens the will of his scientist friend who died 10 years before. It says that he has left an invention in Bururu Mountain. Atom and his friends happen to be on the mountain, and encounter a boy called Akio who lives alone there. They become friends, but... (Source: Tezuka Productions)