The main villain is Dr. Robotnik/Dr. Eggman.
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He was in his debut game, Sonic 3, however he found out later in the game that he was tricked by Robotnik and joined Sonic and Tails
yes shadow the hedgehog is the bad boy of sonic because he just is and he's the loner/Gothic type plus being the bad boy there are like 20,000,000 shadow the hedgehog Fangirls
The anagram of sonic the hedgehog "sonic the hedgehog."
Adventures of Sonic the Hedgehog Sonic The Hedgehog(SatAM) Sonic Underground Sonic the Hedgehog The Movie Sonic X
Sonic the hedgehog is, as his name suggests, a hedgehog.