The Metarex (メタレックス Metarekkusu?, lit. "Metalex"), is a large army of cyborgs and robots featured in the anime series Sonic X. They are led by Dark Oak and have one motive: to control the galaxy (or so it seems). The Metarex serve as the main antagonists throughout the final season of Sonic X, almost replacing Dr. Eggman, although unlike Eggman, the Metarex had everything laid out in advance so that they could both protect vital operations and attack enemy worlds at the same time. They are also known to be very dangerous and vicious as they will do everything just to destroy all planets in the galaxy even if it means losing part of their army. The Metarex became extinct after Dark Oak's death.