The War is over. Doctor Ivo Robotnik, scourge of planet Mobius... is dead. Leaving only his greatest creation, Metal Sonic, to make a final desperate stand against the Resistance assault. But Metal has a plan. A final solution, to survive this war and bring about his father's vision. He needs only one key ingredient - Sonic himself, and the hedgehog's identity.

Thomas Michael Wachowski (the Hedgehog) has now been reunited with his wife and eldest son, after returning from the crazy misadventure of their recent vacation to Sonic and Tails' home world of Mobius. But so much is different now... all Tom wants is a normal life, but with an adventurous wife craving the thrill of life on the other world, and two adult kids living their own lives

After another battle against the forced of the evil Doctor Robotnik, a horribly wounded Sonic the Hedgehog has been retrieved by the Resistance. The Hero of Mobius, longtime champion of the Mobian Resistance, has no chance of survival. Death is certain. Unless they resort to an extreme solution to bring him back to life...