The son of Professor Kenzo Kabuto and older brother of Shiro, a high school student with a great passion for motorcycles, at the age of 16 he was placed at the head of Mazinga Z, the super robot created by his grandfather Juzo Kabuto to save humanity from Doctor Hell , megalomaniac German scientist who wants to conquer the world thanks to the gigantic mechanical automata found in Greece on the island of Bardos, and by the same scientist empowered with modern technologies.