Shadow the Hedgehog is a character from the Sonic the Hedgehog series. Shadow is an artificially-created life form. His trademark hover shoes propel him at extreme speeds that rival those of Sonic, and with a Chaos Emerald he has the ability to distort time and space using "Chaos Control." Often referred to as being the "Ultimate Life Form," he is a black and crimson male hedgehog that debuted in Sonic Adventure 2. He resembles Sonic in many ways, such as the ability to travel at incredible speeds. He is Sonic's rival and is the antithesis of Sonic himself in all aspects of his life. He has been featured in a variety of media, including his own self-titled game. Shadow works together with either Sonic's group or Dr. Eggman, depending on what suits his own needs.