Sonice the Hedgehog is an animal hero, saving poor bunnies and birdies from being turned into evil robotic creatures by the terrible Dr. Robotnik.
He's such a hero to animals that he even has his own puppy sidekick, Sonic the Hedgedog. Unfortunately, this bulldog isn't quite as fast as his hedgehog friend, so sometimes he falls prey to Robotnik's evil tricks.
Sometimes some of Sonic's friend's show up to help him fight too.
In the end though, Sonic the Hedgedog is actually just a strange mutation of the original Sonic the Hedgehog. Who would have seen that one coming?