Sonic Unleashed is a 2008 platform game developed by Sonic Team and published by Sega as part of the Sonic the Hedgehog series. The plot follows Sonic as he attempts to restore the world after his nemesis Doctor Eggman shatters it with a powerful laser to unleash Dark Gaia, an ancient evil which periodically transforms Sonic into a werewolf form (dubbed a "Werehog"). Gameplay features two distinct styles: daytime stages incorporate Sonic's traditional platforming and trademark speed; while night-time stages see Sonic transform into the Werehog and engage in slower combat against waves of enemies using the Werehog's brute strength.

EXE, also known as Faker is the main antagonist of his upcoming game Sonic Prototype 2017 created by Raven.

He is the result of a botched attempt at creating a vessel by the interdimensional entity known as X, who cast him aside shortly after his creation.