Teenager Koji Kabuto pilots the amazing super-robot Mazinger Z to avenge its inventor (his grandfather) against the Mycene Empire, led by the evil mad scientist Doctor Hell.Teenager Koji Kabuto pilots the amazing super-robot Mazinger Z to avenge its inventor (his grandfather) against the Mycene Empire, led by the evil mad scientist Doctor Hell.Teenager Koji Kabuto pilots the amazing super-robot Mazinger Z to avenge its inventor (his grandfather) against the Mycene Empire, led by the evil mad scientist Doctor Hell.