The primary villain of the Sonic games, also known as Dr. Robotnik. Eggman is a genius who builds robots to fight against Sonic and his comrades, but the two have been known to team up. His IQ is 300, but he can be quite immature at times.
When Sonic Adventure rolled around, Sega decided to use the original Japanese name "Dr. Eggman" in all territories. Eggman was voiced by Deem Bristow from all games up to Sonic Advance 3, while Mike Pollock took the role for Sonic X. Although Deem died early in 2005, this is not the reason for the Sonic X cast working on the games starting in 2005; the real reason being that Sega wanted the game voices to be consistent with the show. Mike Pollock naturally inherited the role. Although all of the other characters received new voice actors starting with 2010's Sonic Colors, Mike Pollock was not replaced as Eggman and still voices him to this day.