Sonic universe Journey to the east

"The Iron Dominion has won! New Mobotropolis has fallen, and Sonic has barely managed to escape with a handful of friends. What's a heroic hedgehog to do? Find a new way to fight back--that's what! Sonic leads Tails, Princess Sally and Monkey Khan on a whirlwind tour of the mysterious Dragon Kingdom. Can they break the Iron Dominion's powerbase in its own homeland?"--P. [4] of cover.