Yuusha Raideen is a tV series anime that premiered in spring 1975, produced by Sunrise.

About the production: the story comes from an original script, there are 50 episodes of about 20 minutes and its current status is "finished".

Its main genres are adventure, mecha and sci-fi, with themes such as Super Robot, Male Protagonist, Episodic and Kaiju.

On AniList, Yuusha Raideen has an average score of 65%, a good score, and appears on 1,874 users' lists.

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)

Official synopsis from AniList.