|This character exists primarily or exclusively within the Sonic Underground continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Doctor Robotnik is an evil dictator who was the main villain in Sonic Underground. He resembles the version of Robotnik that appeared in Sonic the Hedgehog (SatAM) and was voiced by Gary Chalk (who also voiced Grounder in Adventures of Sonic the Hedgehog).
Robotnik was assisted in his schemes by Sleet and Dingo. In the series finale Robotnik is defeated when 3 robots controlled by Sonic, Manic, and Sonia crashed into Robotropolis causing an explosion with Sonic stating "Game over, Robuttnik!"
Doctor Robotnik has many different design changes. First off, he has a longer and more colored mustache then in the normal games. He also has a roboticized arm after an incident that happened to him in the Underground. He wears a long belt going around his waist. His boots are shorter and more colorful. Finally, he sports a cape, supported by big, heavy yellow shoulder pads. Dr. Robotnik was modified specifically to look like he were a mechanic.
Robotnik was a consistent villain throughout the series, but didn't appear in many of the episodes. One of the major things he did was in the beginning where he tried to destroy Sonic, but it then backfired when Sonic foiled his plans. He only captured Sonic successfully one time, Sonia a couple times, and Manic multiple times. One of the more famous episodes was where Sonia was faced with a choice to save either Manic or Sonic; if she refused, both would be subject to the Roboticizer.
He is also notable for Roboticizing Sonic's Uncle Chuck, Sonia's adoptive mother Lady Windimire, and Manic's adoptive father Ferrell. In Six is a Crowd, Robotnik is the protagonist instead of the three hedgehogs, and he was rather friendly and kind to them.