A sequel to Great Mazinger, the series follows Duke Fleed, a survivor from the planet Vega and is raised by Dr. Umon as his adoptive son, Daisuke Umon on Earth. Years after his arrival, he's faced with the threat of King Vega and his army, who wants to conquer Earth. With the help of his friends Koji Kabuto and Hikaru, Duke decides to fight back using his best weapon, the almighty Grendizer.
[Source: Anime News Network]