Metal Overlord (メタルオーバーロード Metaru Ōbārōdo) is a transformation that appears in the Sonic the Hedgehog series. It is the finished transformation of Metal Madness, which Metal Sonic attained in order to annihilate his arch-rival, Sonic the Hedgehog, and conquer the world. However, the metallic tyrant was defeated by Team Sonic and stripped of his power.