Sonic, Knuckles, and Tails reunite against a powerful new adversary, Shadow, a mysterious villain with powers unlike anything they have faced before. With their abilities outmatched in every way, Team Sonic must seek out an unlikely alliance in hopes of stopping Shadow and protecting the planet.
When an explosive battle with Dr. Eggman shatters the universe, Sonic races through parallel dimensions to reconnect with his friends and save the world.