Rouge and Topaz are 'hanging out' when Rouge spots some beautiful jewelry in the store across the street, but Topaz blurts out 'Thief!' just to anger Rouge. Then Nelson, Chris' dad buys a expensive ring in the store, because it's his anniversary with Lindsay, Chris' mom. Meanwhile, at the Thorndyke's Mansion, Sonic, Tails, Amy, Cream, and Cheese recieve a phone call from Nelson, telling them to go to his office. But Sonic gets a weird reaction from his Chaos Emerald that he's holding, and it turns out that the 'ring' is actually a Chaos Emerald! Knuckles sees the reaction and goes straight to help the gang. But in the shadows Eggman sees the reaction too and decides to jump in with his giant robot to steal the Chaos Emerald for himself!