Brave Raideen

Brave Raideen (勇者ライディーン, Yūsha Raidīn) is a Japanese super robot anime series in 1975. Produced by Tohokushinsha, Asahi News Agency and Sunrise, it aired on NET (now TV Asahi) for 50 episodes. A spin-off series called Raideen the Superior (超者ライディーン) was broadcast on TV Tokyo in 1996, and an alternative series called Reideen was broadcasted in 2007 on WOWOW.

Brave Reideen
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 the 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.

Reideen
Saiga Junkiis a normal high school student with a gift in mathematics. learns that his archaeologist father, His daily routine is disrupted when his family gets news that his Father's remains have been discovered—a noted archeologist and researcher who had gone missing while exploring a site many years before. Among his remains were notes and artifacts that needed to be identified by the family near a notable triangular mountain in Japan known as "Japan's Pyramid", a place suspected by some to be man-made. A meteor containing a strange robotic lifeform falls from the sky and begins to cause destruction, putting Saiga in danger and causing a mysterious bracelet from his father's research to activate and merge him with an ancient robot burried within the pyramid—a robot the runes describe as Reideen. It is now up to Saiga and Reideen to defend the Earth against the mysterious invaders.

Raideen the Superior
Hishou Washizaki, Ginga Torikai, Ace Haneda, Hayate Ootori, and Ikazuchi Takagi all work at a studio doing various idol-related jobs at the request of their manager, Reiko Amagai. But in reality, these five teenagers are really the Reideens, a group of superheroes who fight the Super Devils sent by Lushu, a mysterious being. Little do the Reideens know, these Super Devils are being sent for a more important purpose...