Giatrus (Japanese: ギャートルズ, Hepburn: Gyātoruzu) is a Japanese manga written and illustrated by Shunji Sonoyama. It spawned two other manga, two anime television series, a television drama, and an anime film. This TV series marked the debut of Joe Hisaishi, composer of My Neighbor Totoro and Spirited Away. The official English title is Gon, The Stone-Age Boy. Source: Wikipedia (en)