Robotnik MkII, formerly Robo-Robotnik, comes from another zone where he took over all of Mobius and defeated its version of Sonic. While Sonic Prime and the Freedom Fighters of Mobius Prime thought that they had gotten rid of him a long time ago, Robo-Robotnik survived because of his ability to transfer his consciousness into another robotic body. He has come to Mobius Prime to conquer it and defeat Sonic and the Freedom Fighters, who defeated the original Robotnik Prime.

He once used Snively as a lackey (completely aware of the fact that Snively caused the death of Robotnik Prime) and for a time he posessed the ability to roboticize anyone with a touch of his hand. He planned to roboticize the overlanders, led by Colin Kintobor, that were living in Robotropolis thinking the city is a safe haven from the "warlike and horrible" furries. It was partially foiled by Sonic and Sally, though Hope lost her family to roboticization. Later, he lost Robotropolis due to a missile attack launched by Station Square's O.T.I.S. and the Bem returned him to being a flesh and blood overlander.

More recently, Robotnik has apparently not been in touch with Snively, who has defected to join the Freedom Fighters. Instead, he relies on the aid of his robot "daughter," Mecha, and A.D.A.M., a sentient computer virus.

This entry describes the version of Robotnik formerly known as Robo Robotink, originating in a parallel zone. For other versions of Robotnik, see Dr Robotnik (disambiguation).

Years ago, in the time of the Great War, Robotnik Prime (then called Julian) was marked for death by his fellow Overlanders on the grounds of betrayal. Running away from the doom that awaited him, he and his nephew Snively took refuge with the benevolent King Acorn - who was already in dire need of help due to the worsening consequences of The Great War. Feeling that he could bring victory to the Mobians, King Acorn appointed Julian as Warlord in exchange for his knowledge of the Overlander armies. With Julian's charge, the Mobians won the Great War and in 3224, the last day of the Great War, King Acorn ordered the dismantling of the War Ministry and Julian's appointment to Minister of Science- just as Sonic's Uncle Chuck abandoned the post due to the roboticization of Jules, Chuck's brother.

Julian, however, had other plans. He had actually stolen the plans for the roboticizer from Sir Charles, and launched a coup on all of Mobotropolis. Rechristened "Ivo Robotnik", he banished King Acorn to the Zone of Silence indefinitely, and took over the now rechristened Robotropolis. From then on Robotnik gained more and more power through treachery, until he had virtually the entire planet under his rule. He uses the roboticizer as his main weapon, turning the good people of Mobius into his mindless robotic slaves. He also has an endless army of SWATbots and Badniks to carry out his evil intentions.

Thanks to Sonic and the Freedom Fighters, and some evildoings on Snively's part, Robotnik died in an attempt to kill Princess Sally and wipe Knothole off the face of the Planet with the Ultimate Annihilator - a large electron gun controlled by satellites that can focus on anywhere on the planet. When the Annihilator backfired, Robotnik Prime was wiped out of existence.

This entry describes the version of Robotnik from Mobius Prime, now deceased. For other versions of Robotnik, see Dr Robotnik (disambiguation).