Doctor Eggman

Doctor Ivo Robotnik, better known by the alias Doctor 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 is a self-proclaimed evil scientist and a genuine genius megalomaniac who dreams of dominating the world with his Eggman Empire using his scientific expertise. For all his brilliance however, Sonic and his friends constantly find a way to foil his plans and keep him at bay.

Never discouraged from his goals, Eggman is always able to come up with a seemingly endless supply of plots to make his world conquest dreams become a reality. His ambitions and schemes ever growing, his plans have evolved from his days of making Animals his robot slaves into incredibly dangerous global threats that have involved building war machines, using doomsday devices to threaten entire nations, and relying on ancient mythological deities or eldritch abominations bent on destruction, all in the name of achieving his goals. Eventually, Eggman has gone as far as to target the entire universe and hatched schemes to control time and space itself.

While all of these plans end in failure due to the continued efforts of Sonic and his friends, the mad doctor is somehow always able to slip away from certain death or imprisonment and escape at the last moment, making him a constant threat to the universe and a thorn in Sonic's side.