Dark Gaia

Dark Gaia (ダーク・ガイア Dāku Gaia ? ) is the main antagonist of Sonic Unleashed. A gargantuan monster (referred to by Professor Pickle as a hyper energy organism), the representation of darkness, night and destruction, who was released from the center of the planet by Dr. Eggman's Chaos Energy Cannon at the start of Sonic Unleashed. Eggman plans to use the power of the great beast in order to conquer the world and establish his EggmanPreview Empire. It is what spawns the monsters that plague the world during the night stages of the game.