During the battle, the three sink into the core of the Earth and encounter Dark Gaia. They are able to place the last Chaos Emerald in the shrine on the final continent at Eggman's new empire, 'Eggmanland', but are interrupted by him Sonic then defeats Eggman who is using a robot that utilizes Dark Gaia's power. Chip was released along with Dark Gaia, but because both of them were released prematurely, he lost his memory, and Dark Gaia was broken apart. Since the beginning of time, the two of them had been in a cycle where Dark Gaia would break the planet apart, and Light Gaia would put it back together. After six of the seven continents are returned to normal, Chip is able to regain his memory he is in fact Dark Gaia's opposite, Light Gaia. Sonic's quest begins, and with the help of some old friends, such as Amy and Tails, he attempts to solve the crisis by traveling the world's continents, finding shrines that will fix the Emeralds, in order to return the world, and himself, to normal. Assuming he has caused it with his fall, Sonic decides to assist him in his quest to find out who he is, and the creature becomes a guide for the player Sonic soon gives him the nickname Chip. Eggman then ejects Sonic into space, who then lands safely onto the planet below.Īfter landing along with the Emeralds, Sonic encounters a friendly creature who appears to suffer amnesia. In addition, the ray and drained Chaos Emeralds have the unforeseen side-effect of transforming Sonic into a 'Werehog' - a beast form with greater strength and abilities - at night. He then uses the Emeralds' energy to fire an enormous laser and unleash a powerful beast, Dark Gaia, from the center of the planet, which has devastating consequences, shattering the planet into seven pieces. However, Eggman manages to trap him using a powerful new ray weapon which drains the power of the Chaos Emeralds, causing them to turn gray and useless. After a brief chase through the airships, Sonic corners Eggman. After the defeat of several of his robots, Sonic transforms into Super Sonic.

Sonic Unleashed begins with a cold open that sees Sonic confronting his nemesis, Doctor Eggman, bounding around a fleet of spaceships.

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