Shadow the Hedgehog was encountered by the leader of the Black Arms, Black Doom to find the 7 Chaos Emeralds and give them to him. Shadow has forgotten all about himself and decides to get the Chaos Emeralds so he'll remember who he is. In all ten endings, Shadow has collected the Chaos Emeralds to himself and declares who he is. Once the ten endings are done, a secret ending can be unlocked. Shadow refuses to give the Chaos Emeralds to Black Doom, who is his father. Black Doom spreads nerve gas towards Shadow's friends and becomes Devil Doom. Shadow becomes Super Shadow and defeats Devil Doom.