Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Lionel is a character appears in the Sonic Underground television series. He is an anthropomorphic lion and the father of Cyrus.
Robotnik captured Lionel 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.