Yuusha Raideen
Japanese title: 勇者ライディーン
Alternative titles: Yusha Reideen, Brave Raideen, Reideen the Brave
Type: TV
Source: Original
Episodes: 50
Status: Finished Airing
Aired: Apr 4, 1975 to Mar 26, 1976
Broadcast: Fridays at 19:00 (JST)
Duration: 24 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Sunrise
Producers: Tohokushinsha Film Corporation
Genres: Action, Adventure, Sci-Fi
Themes: Mecha

After a slumber of 12 millennia, the Demon Empire returns to seize control of the Earth. Reideen, the giant robot-like protector of the lost continent of Mu, senses the evil presence and awakens within its golden pyramid, revealing to young Japanese boy Akira Hibiki that he is the one descendant of the ancient Mu people who must help Reideen save Earth.

He was assisted by his friends, token girl Mari Sakurano (daughter of a scientist fighting the Demon Empire) and several members of his high school soccer team. 

(Source: AniDB)