- "I am Dr. Robotnik, the greatest scientific genius in the world!"
- —Dr. Robotnik, Sonic Adventure
Doctor Ivo Robotnik (*ドクター・ロボトニック Dokutā Robotonikku, lit. "Doctor Robotnik"), more commonly known by his alias, Doctor Eggman (ドクター・エッグマン Dokutā Egguman), is the main antagonist of the Sonic the Hedgehog series. He is a mad scientist and a self-proclaimed genius with an IQ of 300. He is the grandson of Professor Gerald Robotnik, the cousin of Maria Robotnik, and the ancestor of Dr. Nega. His ultimate goal is to conquer the world in order to build his utopia, the "Eggman Empire" (also known as "Eggmanland" or "Robotnikland"). Although he's the main antagonist in nearly every game, there have been many instances in which he was usurped by other villains.