Can Sonic outrun a virus that turns everyone into robotic zombies? The world has fallen to the Metal Virus, a manufactured plague that transforms all it infects into mechanized "Zombots" under Dr. Eggman's command. Even Sonic the Hedgehog has been infected, though his speed has allowed him to keep the virus at bay. Now, with the population more infected than not and the virus constantly spreading, Sonic and his friends in the Restoration launch a desperate plan! But, when things go from bad to worse, our heroes find themselves on Angel Island, the last safe place on the planet. Sonic and his remaining allies have no choice but to form an alliance with their old foe Dr. Eggman to defeat the Deadly Six and reclaim the Chaos Emeralds in a last-ditch effort to save everything.