Somewhere in an undisclosed location, the evil scientist Gerald Robotnik is creating what could be a match for Sonic the Hedgehog. His name is Shadow, and he's been endowed with the same powers of speed and agility as Sonic. Soon he will be unleashed into the world, where he will challenge and ultimately defeat Sonic, leaving Robotnik free to take over, enslave, and "roboticize" the population. How will our little blue hero fare against this little black demon?