Chuck took the heroes into the Crystal Mine and showed them a massive Energy Crystal, which Robotnik's forces were intended to extract. If that much Energy Crystal was removed, then Mobius' ecosystem would be destroyed. Taking action, Sonic, Bunnie, and Chuck took control of a Dinobot, which they planned to use to destroy the ropes pulling the Energy Crystal out of the mine, while Sally and the others handled the control room. Although the Swat-Bots tried to stop Sonic's team, the heroes eventually destroyed the ropes, which made the crystal fall back into the mine and get shattered. Having accomplished their mission, Sonic and his friends planned to get out of the Crystal Mine by train. However, along the way, the Power Ring used to restore Chuck's mind wore off, causing Chuck to turn back into an aggressive robot. Although Sonic did not want to leave him, his friends forced him to do so in order to escape Robotnik's forces. On the train ride however, Sonic promised that he would come back for his uncle.

Meanwhile Sonic was sad that he couldn't save his Uncle, Chuck