In this grand finale to the 'Journey to the East' story arc, Sonic must confront the traitor to the Chaotix-Espio! But Sonic isn't the only one in a face-off: Monkey Khan comes up against the enigmatic Bride of the Shinobi Clan, and a long-held secret is revealed! History unfolds, hidden traps are around every corner, and the fate of the world hinges on this final mission!