It has been a year since it happened. Dr. Eggman created a virus he hoped would destroy only Sonic, but the outcome was much more grim. The infection spreads through contaminated water in lakes, oceans, puddles, and rain. A single touch of contaminated water to your skin and it's only a matter of time. The world has been thrown into chaos. a fraction of the population has survived. Sickness is in the air, corpses litter the roads. A disease that takes root and forms tumors has spread throughout Mobius...

You are in a Restoration Bunker, with some of the last remaining members. Sonic is sitting on a couch, looking to be in total agony and incredible pain. A cancerous tumor runs up the side of his face, covering and blocking vision from his right eye. It is bubbly and leaking a form of mucus. Amy Rose cleans and tends to the infection, sitting next to him.

Amy: "You poor thing..."

Sonic: "Ah-! I-it's fine, no really, I'm okay..."

Shadow sits on a chair over by the corner, cleaning blood from a machete, while Metal Sonic and Blaze are sorting cans and bottles of water.

Metal: "Water status: Uncontaminated."

Blaze: "Perfect. That should last us about a week. I'm sure we can find more later."