Ittetsu was once a 3rd baseman until he was injured in World War II and was forced to retire; now an impoverished and bitter widower, he's raised Hyūma and his older sister Akiko in a very severe environment.

From the grueling training to battling the rival Mitsuru Hanagata in the Hanshin Tigers, Hyūma would have to take out his best pitching magic to step up to the challenge.

The first Star of the Giants movie debuted on July 26, 1969, as part of the vacation anime festival on large screen theatres in color.

Mighty Atom TV special reached the United States and was renamed to Astro Boy vs. the Giants.

[5] Episode 18 of Kyatto Ninden Teyandee (dubbed and released in North America as Samurai Pizza Cats) includes a pitcher named Puma Pochi, voiced by Tōru Furuya, as a direct parody of Hyūma Hoshi.