The nightmare has only just begun for Sonic's friends, especially when they learn he's become one of ancient villain Mammoth Mogul's many new followers! How can that be? Is Sonic really involved in Mogul's dastardly schemes, and if so, how? As if that weren't enough, the stakes rise even higher when the Chaos Emerald gets involved! It's a mind-blowing tale of turmoil and intrigue you won't want to miss!