One year after the planet fixed while saving his girlfriend Amy from Dr. Eggman, Sonic was injected with a serum that causes him to transform into a Werehog. But now when he transforms he cant control himself any more and he becomes a violent monster with black and dark green fur. Sonic doesn't want Amy to find out because last time he turned he almost killed her.

The long hard journey of one Lucario and how he figures out what has happened to his master Vega. On his journey he meets a trainer named Nere who will help him find out the mystery.