When Sonic and The Freedom Fighters take out Robotnik's main computer, they're trapped by Swat-Bots in an underground tunnel, only to be rescued by a handsome teenager named Griff. Griff takes them deep beneath the Big City, where Sonic has to fight off some Rat-Bots. They finally arrive in lower Mobius, where a group of Mobians have taken refuge from Robotnik and built a community, which is dependant on an energy cube for all its power. Unfortunately, the energy cube is losing its power, which Griff keeps a secret. Later at Knothole, where Griff learns of Sonic's power ring, he steals the power stone from Knothole's grotto and returns it to lower Mobius to replace their fading energy cube. Sonic tracks Griff back underground, saves him from a pack of Rat-Bots and ends up giving Griff a piece of the power stone.
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