Sonic Unleashed begins with a fast-paced movie featuring Sonic completely demolishing Dr. Eggman's space forces, quickly confronting the evil doctor himself as Super Sonic with the Chaos Emeralds. Eggman begins begging for mercy, and as Sonic begins to gloat about the situation, Eggman springs a trap, capturing both Sonic and the Emeralds. Eggman uses a machine to extract power from them and direct it at the planet below, which cracks the planet into pieces and awakens a demonic beast within. The energy transfer drains the Emeralds while simultaneously transforming Sonic into a beastly, fanged werehog. No, it doesn't really make sense.