Who is Dark super sonic

dark super sonic is a dark form of super sonic seen in sonic x he was tested on by metarex to test his fake chaos emralds dark metal sonic looks exactly like super sonic but he has no eyes, is black, and has a blue arua dark spine was formed when sonics negative energy was drivin through the fake emralds and thus dark super sonic was born, but he lost his powers when eggman calmed him down ''sonic normally acts much better than this'' he said and dark super sonic was never seen again