Five years have passed since the Metal War. Some have moved on. Others haven't. When war hero: Sonic the Hedgehog, finds out the infamous Dr. Robotnik has resurfaced with a new scheme that puts the world at stake, he sets out with his two-tailed best friend: Miles "Tails" Prower, to stop the nefarious monster. New friendships will be made, rivalries will be forged, and limits will be pushed.