Eggman, Decoe and Bocoe are putting the lives of hundreds in danger — including Sonic’s friend Chris — as they hatch an “explosive” scheme to empty the bank’s vault. Sonic, Knuckles, Amy, Cheese and Tails must save the day...and things go from bad to worse as they attempt to recover a lost Chaos Emerald before Eggman gets his mitts on it. Worst still, the Chaos Emerald is at the bottom of the ocean and Sonic can’t swim!