Persona 4: Sonic the hedgehog

After defeating Eggman......AGAIN! Sonic and his friends decided to throw a party just for the fun of it. After the party was over Sonic went to bed. When he fell asleep in his bed he had a dream, he saw another version of himself. It was Sonic.EXE, also known as Exterior or as I liked to call him. Sonic's shadow. But Exterior wasn't evil....like we expected him to be, he told Sonic that a danger is coming and only Sonic and his friends can stop. BUT one problem, Exterior told Sonic that ONLY those who have a shadow may join Sonic on this quest to save the world again but not from Eggman.....a mysterious new villain....who are these chosen people that Exterior mentioned? And what purpose does he have to help Sonic? Read to find out