Kyojin no Hoshi tai Tetsuwan Atom
English title: Star of the Giants vs Astro Boy
Japanese title: 巨人の星対鉄腕アトム
Type: Special
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Sep 6, 1969
Duration: 30 min
Rating: G - All Ages
Studios: Tokyo Movie Shinsha, Mushi Production
Producers: Nippon Television Network
Genres: Sports

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)