Dr.Eggman gets tired of being attack by Sonic and his super speed as a hedgehog and brute strength as a feral werewolf and he felt tired of being bald, fat, having a mustache and unable to walk real far and his ugly looks so he drinks a bottle of wolfbane to transform into a feral werewolf to get back at Sonic and run faster and look better as a feral werewolf then as a mad scientist.