無敵鐵金剛
Appearing only in the novel version. This Mazinger Z appears severely damaged as it leads an army of mass-produced versions of itself called the Mazin Brothers in a losing battle against an enemy army. Despite its condition and the grim situation, Mazinger Z continues to battle until the arrival of Mazinkaizer SKL who provides the much needed reinforcement. The pilot of Mazinger Z is not named.