The evil scientific genius known as Dr. Ivo "Eggman" Robotnik is the long-time nemesis of Sonic. He's got the master plan, devising many schemes in attempts to destroy Sonic and conquer the world, but he fails 99% of the time; though he's very unpredictable. He is Gerald Robotnik's grandson, and Maria Robotnik's cousin, and is also said to possess an IQ of 300.
English dub voiced by Deem Bristow (R.I.P), and Mike Pollock.
Japanese dub voiced by Ootsuka Chikao (R.I.P), Takiguchi Junpei (OVA) and Nakamura Koutarou.