Dr. Eggman has unleashed his most terrifying weapon yet. The Metal Virus is sweeping across the globe, transforming everyone it touches into mindless robotic zombies under the evil doctor's control. Even the fastest hedgehog alive hasn't escaped the infection. Sonic is infected, and only his incredible speed is keeping the metallic plague from taking over his body completely. With the world falling apart and the virus spreading rapidly, Sonic and his friends in the Restoration have to act fast. Tails is working frantically to synthesize an antidote, and Amy is leading the rescue operations to save whoever is left. Sonic must keep running to provide vital data to stop the disease. But when the desperate plan hits unexpected roadblocks, the pressure reaches a breaking point. Every second counts as Sonic races against his own slowing body to save the planet. The fight to cure the world all comes down to the very last minute.