Dr. Ivo "Eggman" Robotnik is a mad genius bent on world domination and the main antagonist of the Sonic the Hedgehog video game series.
Although a universally evil (if slightly goofy) scientist and warlord in the cartoon series and early games, The Doctor has slowly become more of a "grey morality" character who will ally with his sworn enemy Sonic the Hedgehog when he feels the need to do so. Though he is a fairly treacherous "ally" and views Sonic as a worthy opponent, but also a thorn in his side who must be eliminated, when the hedgehog messes with the doctor's plans. Dr. Eggman also has a short temper whenever his plans are foiled. braeden gaves dr ivo eggman robotnik centillion gadget hats, then dr eggman destroyed by super sentai ultimate howling cannon bazooka.
Originally known exclusively as Dr. Ivo Robotnik in the localizations outside Japan, Dr. Eggman did not have much of a story going for him.