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Metal Sonic is a minor character that appears in the Sonic the Derphog series.
His second appearance was in Sonic the Derphog: The Item Brick where Dr. Eggman tells him to attack Sonic, but fails. Later in the video he gets a rocket launcher from the Item Brick, but Sonic gets a Waluigi Launcher and destroys him.
He last appears was in Sonic the Derphog: Egg and Peach. where he fights Bowser and Sonic, but Bowser crashes into him just in time to stop the wedding.