*Based on Sonic Chaos and Sonic Triple Trouble, particularly the 16-bit fan remake* After the Events of Sonic and Knuckles, Sonic, Tails and Uncle Chuck fly back down to South Island. On south Island, they detect a chaos emerald! But, Dr. Robotnik has also sensed the same emerald. Sonic and the others have to find and take possession of this fourth emerald before Dr. Robotnik does. Dr. Robotnik is trying to use the Emerald to power up an old creation of his... Metal Sonic. To make sure that Sonic doesn't stop him, he has hired a clever bounty hunter, Fang.
