Six months have passed since Sonic, Shadow, Tails, and Nyx returned the Crystal Heart to the Crystal Empire. Now it is Sonic and Shadow's big day as they get ready to marry Rainbow Dash and Sunset Shimmer. But before they could perform the ceremony, Nightmare Amy crashes the wedding. She takes the main six away, and scatters them in different parts of Equestria. Now it's up to Sonic, Shadow, Tails, Knuckles, Nyx, Sunset, Spike, and an old friend of Sonic's to save them. Will they do it, or will Nightmare Amy finally get her revenge?