The first of three stories that will rock the world of Sonic to its core! Many of Sonic's worst enemies have been clawing their way out of the rogues gallery lately. Now, not one but two of the biggest villains in Sonic history, Mammoth Mogul and Ixis Naugus return to make Sonic and the Freedom Fighters' lives miserable! And the one to blame for all this is the mysterious nemesis known only as "Anonymous". Will the secret of Anonymous finally be revealed?