Robotnik has awakened the ultimate lifeform, created by his own grandfather Gerald, so he could have him destroy Sonic and conquer Mobius once and for all. This might as well be his deadliest plot yet. Sonic and his friends investigate sightings of a mysterious hedgehog until they finally see that the hedgehog they're looking for is actually Robotnik's ultimate lifeform: Shadow the Hedgehog. In their adventure, they'll encounter an ultimate lifeform reject called the Biolizard, find the Chaos Emeralds, all are efforts to stop Robotnik from opening the all-powerful eclipse cannon on the Space Colony ArkShadow has mortally wounded Longclaw, making Sonic very angry and bent on revenge. Eventually, Sonic sees that Shadow's not the bad guy, they reconcile and go super to stop Robotnik from destroying Mobius.
