Could this be the end of the South Island? That evil maniac Dr. Robotnik™ has another twisted idea to take over the world! This time he wants to steal the mystical Chaos Emeralds.

The Emeralds are the source of vitality for all living things. But in the hands of Dr. Robotnik, they could be turned into nuclear bombs and laser weapons!

The evil Doctor has already snatched the Red Chaos Emerald, causing the other Emeralds to lose balance and fly off into a parallel universe. Now South Island is sinking into the ocean. Sonic and Tails will have to use all thier super speed and super stunts to stop Dr. Robotnik and restore harmony to the universe!

"Okay, Dr. Robotnik," says Sonic, "You're charged with contempt of hedgehog. There's no time to lose. Gotta slide, Clyde!"