Metal Sonic, IDW Sonic Hub

You may be referring to the Classic dimension version Metal Sonic is a villainous robot created by Dr. Eggman to rival the skills of Sonic the Hedgehog. When Dr. Eggman disappeared after the Eggman Empire lost its war with the Resistance, Metal Sonic took over as ruler of the Eggman Empire to conquer the world on behalf of his master. However, he was defeated by Sonic and the Resistance and returned to Eggman's side after the doctor's return. Metal Sonic was created by Dr. Eggman years ago as a

Sonic the Hedgehog (IDW) / Awesome - TV Tropes

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Metal Sonic, IDW Sonic Hub

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