Replying...
Intro. Shadow The Hedgehog is a red and black hedgehog, artificially created by Dr.Gerald Robotnik, using Black Doom's DNA. It was created in order to create a cure for the granddaughter of Dr.Gerald Robotnik, Maria. Unfortunately, the G.U.N agency to find out the Shadow project Which was the only light and person who worries for Shadow. After that Shadow, G.U.N captured Shadow for considering him a threat and left him frozen inside a capsule for 50 years. Fifty years later, Dr.Eggman Libre him to do his ally and conquer the world. Promising that they would destroy it, to avenge the death of Mary. Notwithstanding for the intervention of Sonic and his friends, he was persuaded, convincing him that this is not what Maria would have wanted. So in the end, along with Sonic they would save the world.

Shadow the Hedgehog

@Hikari