Shadow the Hedgehog is a fictional, anthropomorphic black hedgehog from the Sonic the Hedgehog series and the arch-rival of Sonic the Hedgehog. He is voiced by Kirk Thornton in the American English dub, who also voiced Saix in Kingdom Hearts series and Kunimitsu Tezuka in The Prince of Tennis.
Shadow was created by Professor Gerald Robotnik to help his granddaughter Maria. He was made from the blood of Black Doom, who wanted to eat the humans of Earth. Gerald however, planned for Shadow to save them all. But then G.U.N. came and killed Maria. Then Gerald brainwashed Shadow so that he could destroy humanity.