Following an accident on the central railway tracks of Mobius, where important political figures were traveling, Sonic, Tails, and Knuckles discover that there's more to this mysterious disaster. Zenith, a new villain, wants to completely enclose the planet within a giant Moebius, preventing foreign influence from other inhabitants and lands, given the progressive degradation Mobius is suffering. Although this idea will cause various problems for the planet, the end justifies the means. Dr. Eggman joins him to finance his objective, but with a hidden agenda. Everything becomes a race against time, and Sonic isn't sure he can win.
