UFC 84: Ill Will was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on May 24, 2008, at the MGM Grand Garden Arena in Las Vegas, Nevada. The card featured the return of Sean Sherk, who was suspended and stripped of his UFC lightweight title after he tested for steroids at UFC 73. He faced B.J. Penn, who had since won the vacated title.
Rameau Thierry Sokoudjou | Wanderlei Silva | Keith Jardine | B.J. Penn | Lyoto Machida | Sean Sherk | Shane Carwin | Wilson Gouveia | Thiago Silva | Kim Dong-hyun | Rousimar Palhares | Rich Clementi | Goran Reljic | Tito Ortiz | Antonio Mendes | Ivan Salaverry | Kazuhiro Nakamura | Christian Wellisch | Yoshiyuki Yoshida | Terry Etim | War Machine