It has been more then a month since the destruction of Mephiles the dark and harmony was once again restored in Equestria, so Celestia sends Sonic, Shadow, and their friends to the Crystal Empire to introduce them to Twilight's brother Shining Armor and her sister in law Princess Cadence. But the new Nightmare Moon decides to cause trouble and decides to make a new evil hedgehog named the Chaos Phantom out of the Chaos Emeralds to get rid of Sonic and Shadow once and for all. As Chaos Phantom arrives at the Crystal Empire during the night, the New Nightmare Moon tells him to take the Crystal Heart and then he disappears in a mirror before Sonic, Shadow, and the others could stop him. Can Sonic, Shadow, and two of their friends go into the mirror and stop Chaos Phantom or will he carry out the new Nightmare Moon's wishes and finish them once and for all?