Yuusha Raideen

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.

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After centuries of peace, the Demon Empire emerges and attacks Earth. All seems lost until a boy named Akira is summoned by a strange voice and awakens the god-like robot known as Raideen. Meanwhile, the Demon Empire kidnaps Akira’s father and other scientists, trying to find a mysterious substance known as Mutron; and it’s up to Akira to save him! Akira and Raideen must now defend Earth from the Demon Empire and its fossil beasts, while trying to find and rescue his father. Fortunately they do not have to struggle alone; Akira’s friends and great scientists will aid in his quest to put a stop to the Demon Empire, once and for all!