Hajime Ningen Gyatoruz
Japanese title: はじめ人間ギャートルズ
Alternative titles: First Human Gatorus, First Human Gattles, First Human Giatrus, Giatrus, The Dawn of Mankind
Type: TV
Source: Manga
Episodes: 77
Status: Finished Airing
Aired: Oct 5, 1974 to Mar 27, 1976
Broadcast: Saturdays at 19:00 (JST)
Duration: 24 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Tokyo Movie Shinsha
Producers: Asahi Broadcasting
Genres: Comedy
Themes: Historical

A comedy about the wacky adventures of Giatrus and his tribe of the first human beings on the planet. 

(Source: AniDB)