|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.
Robotnik captured him to work for him and to get Cyrus to do what he wanted. In the end, Lionel was roboticized. He later reappeared where he worked on Robotnik's "Sleeper" Project and helped destroy them. It is unknown if he still works for Robotnik.