After their adventure, the gang would like to relax. But one day, Sonic goes to get some things and doesn't come back until later. After that, he starts acting stranger and meaner. He soon turns from mean, to pure evil. The gang has to stop him! But they don't know what is happening! they can find the answer to why and get help from one hedgehog.....Can the gang defeat Sonic's rein? Of perhaps, it isn't Sonic; it's someone else.

Sonic and Amy don't know each other. Sonic lives a life of popularity and being a modern day hero. Amy, on the other hand, lives a life of solitude. But they do have something in common: a relationship with Eggman. And not good ones, either. Sonic foils Eggman's plans on the daily and Amy, well, she has her own reasons. But one day, Eggman finds a way to put both of them in his dungeon. The two meet, but don't get along.