Sonic battles the ancient, evil Mammoth Mogul-who has lost his Chaos Emerald and been imprisoned, but backing him into such a corner only made him more dangerous! Mogul uses his remaining powers to summon a new Fearsome Foursome-and Sonic is forced to be one of them! Every mercenary and cut-throat is hired to take Sonic's shoes-feet being optional! It's Sonic versus everyone else while the malicious mammoth laughs from the shadows! How can Sonic overcome all the odds?