Sonic the Hedgehog 3: Operation: Shadow

In an underground laboratory owned by GUN, Shadow the Hegdehog lies in an unconscious state. Gun then decides to get Sonic's help to retrieve Shadow, but they need to do it fast. The Black Arms should never get their hands on Shadow. If Sonic and his friends fail to protect Shadow and make him their ally, Black Doom will be the cause for the universe' downfall.