Sonic the Hedgehog follows the exploits of a group of rebel freedom fighters as they fight back against the dictatorship of Dr. Eggman. Dr. Eggman wants nothing less than total planetary domination, through a process known as "roboticization" - the act of turning a living creature in to a cold, robotic slave. At the center of this struggle are seven mysterious "Chaos Emeralds" that radiate a strange, otherworldly energy.