Grendizer U

Duke Fleed is the sole survivor of his home planet, Fleed, and has taken refuge on Earth inside a strange spacecraft. Raised by Dr. Umon as his adoptive son, he goes by the name Daisuke Umon. Years later, when King Vega and his forces threaten to invade Earth, Duke joins forces with his friends Koji and Hikaru-and later his younger sister, Maria Grace-to resist. His greatest weapon in this fight is the powerful robot Grendizer.