The world used to be filled with cities and communities filled with life and Mobians, until G.U.N. decided they wanted to try and find a cure to cancer. Instead, they created and weaponized a deadly virus that reanimated your body after you died. While the virus did bring you back to life, you weren't… you.

After the fall of the Space Colony ARK, Sonic and Tails discover a body trapped in a cryogenic chamber 50 years after its demise.