Ivo Robotnik, also known as Doctor Ivo "Eggman" Robotnik and by his title Dr. Eggman, is the main antagonist of the Sonic the Hedgehog series and founder of the Eggman Empire. He is a Human scientist who's main agenda consists of dominating the universe and turning animals into robots so that they can be apart of his armies.
Despite having an IQ of 300, so far all of his plans have failed thanks to Sonic and the Heroes. He still never gives up and will continue expanding his warmongering Empire to its greatest extent. As of today, Eggman, alongside with his empire, is viewed as a global threat by the Acorn Kingdom, the United Federation, GUN and DESTRON.
His main residence is the Death Egg, a space fortress and key component to his Empire's various quests for a universal domination.
Although his birth date has been disputed, in his childhood, Ivo looked up to his grandfather, Prof. Gerald Robotnik as a hero, and believed him to be a great man who had done his best to help mankind. Thus he decided to follow in his grandfather's footsteps and became a scientist, as well as pursue a teaching degree (apparently because he liked telling people what to do). However, he became obsessed with the idea of an entire world under his rule, utterly convinced with his twisted belief that the results of a world conquest orchestrated by him would make the world a better place and benefit all its inhabitants. Using his unmatched genius, Eggman began his plans, spending his entire life on his self-righteous mission.
At some point after setting out on his quest for global domination, Dr. Robotnik met Sonic the Hedgehog. While the nature of their meeting is unknown, the two of them eventually became rivals, with Sonic proving to be Dr. Robotnik's greatest enemy. After their meeting, Dr. Robotnik made several attempts to conquer the world, but at every turn, his plans were laid to waste by Sonic.
Founding of the Eggman Empire
Sometime during his life, he founded the Eggman Empire. During the events of the 1st Sonic the Hedgehog game, he attempted to find the powerful Chaos Emeralds by conquering South Island and turning its Animals into robots. Launching a full-scale assault, Robotnik was able to seize control over countless cities, factories, and lands, and transformed them into his image and polluted the very environment with his fortresses. Robotnik ordered his vast army to search for the Chaos Emeralds and build weapons of mass destruction so that his dominance would never be challenged. Luckily, Sonic the Hedgehog sped to the rescue, defeated Robotnik, saved the animals from being turned into Badniks, and retrieved the Chaos Emeralds. Thus the island was restored to its former, peaceful state.
In the events of the 1992 sequel Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis, the notorious Robotnik created the Death Egg, a huge, orbital space station during another attempt at world domination. He attacked West Side Island, turning its animals into robots and searching for all seven Chaos Emeralds. He was intercepted by Sonic and his sidekick Miles "Tails" Prower, who saved the animals and retrieved the Chaos Emeralds before the evil scientist. Sonic infiltrated the Death Egg, sending the Death Egg crashing back to Earth and defeating Robotnik again.