The UFC lightweight title is on the line as champion BJ "The Prodigy" Penn throws down against Sean "The Muscle Shark" Sherk. In the light-heavyweight division, "The Axe Murderer," Wanderlei Silva, faces "The Dean of Mean," Keith Jardine. Other exciting mixed martial arts fights include "The Huntington Beach Bad Boy," Tito Ortiz, taking on Lyoto "The Dragon" Machida, and Brazilian Wilson Gouveia battling Croatian Goran Reljic.