Dr. Ivo Robotnik, better known by the alias Dr. Eggman, is the main antagonist of the Sonic the Hedgehog series. He is an evil human scientist and the arch-nemesis of Sonic the Hedgehog. Boasting an IQ of 300, Eggman dreams of dominating the world, but his constant plots to establish his Eggman Empire are always thwarted by Sonic and his friends.