Sonic, Manic and Sonia are thrown into a universe that almost seems to parallel their own, however in this dimension, they are not the in the Underground, the Hedgehogs are the rulers of Mobius.

Secrets of the Chaos Emerald focuses on Sonic, Manic and Sonia as they help Knuckles, Floating Island's stern guardian of the Chaos Emerald, protect the Chaos Emerald from Dr. Robotnik and his ...