Mecha Sonic Mk. II, Metal Sonic Wiki

You may be looking for other Mecha Sonics. Mecha Sonic is another robotic counterpart of Sonic, he is the final boss of Knuckles' story mode in Sonic the Hedgehog 3 and has a super form called Super Mecha Sonic Super Mecha Sonic

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Mecha Sonic MK. 1 (Sonic 2) - 3D model by Spex130 (@spex130) [1431dad]