Yamato Versus Dorado!
In the ancient, legendary past, the peaceful kingdom of Mu is under siege by the war-like Dragonian Empire. Source: crunchyroll
Aired 16/09/1984EP 21 - Yamato Versus Dorado!
1984
GOD MAZINGER
The story is set in modern times, but the twist to the story is that Mazinger is an ancient weapon of the gods, left on earth to battle the evil space gods who have returned to take over the universe.