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Having superhuman speed, Sonic is forced to abandon his home world of Mobius and ends up on Earth. After being discovered on Earth, he teams up with a human named Tom Wachowski to stop Dr. Ivo Robotnik, who wants to harness his powers.
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Sonic joins forces with Tails to stop Dr. Robotnik, who recruits Knuckles the Echidna to find a powerful emerald that has the power to build and destroy civilizations.
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Knuckles the Echidna takes Green Hills deputy officer Wade Whipple as his apprentice, teaching him the ways of the Echidnas.
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Sonic, Tails, and Knuckles take on a mysterious and powerful adversary, Shadow the Hedgehog, while Dr. Ivo Robotnik reunites with his lost grandfather, Prof. Gerald Robotnik, unaware that Gerald has a sinister agenda of his own.
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