Sonic and the Freedom Fighters journey to Robotnik's lab in hopes of deciphering his roboti-sizer system. While underground, Sonic spots his now roboti-sized Uncle Chuck aboard a Badlands bound mine-train and devises a plan for his rescue. The Fighters board a jet-powered railcar, dodging Hover-Units and Swat-Bots, before reaching Uncle Chuck and whisking him off into an abandoned tunnel. By placing a Power Ring in Chuck's hands, Sonic breaks Robotnik's robot-spell and is reunited with his uncle. Uncle Chuck anxiously warns Sonic of Robotnik's latest invention the "Energy Crystal", capable of destroying all life on Mobius. Warding of Dino-Bots and the usual Swat-bot brigade, Sonic and the Fighters are able to locate and destroy the Energy Crystals before the force of the power ring fades, turning Uncle Chuck back into his roboti-sized state.
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