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The series takes place on Mobius, a planet mostly populated by anthropomorphic animals. The Kingdom of Acorn, based within the city of Mobotropolis, was at war with an unseen enemy. King Acorn recruited a human scientist named Julian to build war machines to end the war with a victory. However, during peacetime, Julian and his nephew Snively launched a coup d’état against the kingdom. The King is banished to another dimension called the Void and most of the citizens are captured and permanently transformed into robot slaves, through a machine called the Roboticizer. Julian renames himself as Dr. Robotnik, now the dictator of Mobius. Mobotropolis is renamed Robotropolis, a polluted, industrial cityscape.

Robotnik finds himself at odds with a small collective group called the Freedom Fighters, who operate out of the hidden woodland village of Knothole. They are led by Sonic the Hedgehog and Princess Sally Acorn, King Acorn’s sole heir. Other members include Sonic’s best friend Miles “Tails” Prower, computer genius Rotor the Walrus, French coyote Antoine Depardieu, half-roboticized Bunnie Rabbot, and Dulcy the Dragon. They act as a rebellion against Robotnik’s regime. Sonic uses the Power Rings to gain a temporary boost in power. Both the rings and the Roboticizer were designed by Sonic’s uncle Chuck, one of the victims of the machine.