Kyojin no Hoshi tai Tetsuwan Atom

Star of the Giants vs Astro Boy is an anime crossover special that aired on September 6th, 1969. Broadcasted by the TV Network Nippon Television, it was a collaboration between the studios Tokyo Movie and Mushi Pro in which rival characters on the same network would battle each other over a game of baseball. It’s considered one of the oldest anime crossover specials, but despite its historical significance, only small clips have surfaced over time.(Source: Lost Media Wiki)

anime-lists/anime-movieset-list.xml at master · ScudLee/anime

Tetsuwan Atom (1980) - Anime - AniDB

MyAnimeCloud

Happy Anime Soundtrack Funtime « Lost Turntable

Kyojin no Hoshi vs. Tetsuwan Atom, Kyojin no Hoshi Wiki

Everything you need to know about Atom Tetsuwan

Star of the Giants (TV Series 1968–1971) - IMDb

Kyojin no Hoshi: Chizome no Kesshousen

Tetsuwan Atom (Astro Boy) · AniList