Bad Knight's body is primarily covered with gray armor over his entire body. His feet are gray and his head is gray, too. He has white feather on his head. Before he was tamed, he had copper red armor, same white feather and rides a cello. He had an angry face and looked very mean before he was tamed.
The Knight has only appeared in one episode of The Little Einsteins: The Good Knight and the Bad Knight from Season 1.