Doctor Eggman Nega or just Nega, is a futuristic mad genius and a major antagonist in Sonic the Hedgehog franchise, introduced as an alternate universe counterpart of Dr. Eggman, though revealed as Dr. Eggman's descendant in later sources, and the main adversary to Sonic's counterparts Blaze the Cat and Silver the Hedgehog. He served as the main antagonist of the Sonic Rivals series and in the Sonic Rush Series alongside Eggman.