Virus's Vengeance: Turbo's Return

Turbo has Returned to Sugar Rush, but is all as it appears? With Unlockable Racers suddenly popping up and the Turbotime Twins joining the game, how will the whole Arcade deal with Turbo? Is Turbo really back for Vengeance? Or is he merely the victim of terrible circumstance and timing? With a Virus on the loose, seeking to destroy all, can they stop it? Or is it to late already?