Original story: Nagai Go and Dynamic Planning
Broadcast Period: October 5, 1975 - February 27, 1977 / 74 episodes

　The Vegans, the united forces led by King Vega, invades the Earth in an attempt to conquer the universe. Daisuke Umon is Duke Fleed, the Crown Prince of planet Fleed, which was once destroyed by the Vegans. Daisuke fights on Grendizer, the guardian deity of planet Fleed, to protect his second home, Earth.