UFC 100 was a mixed martial arts event produced by the Ultimate Fighting Championship (UFC) on July 11, 2009, in Las Vegas, Nevada. The main event was a rematch between UFC Heavyweight Champion Brock Lesnar and Interim UFC Heavyweight Champion Frank Mir.
| Actor | Role |
|---|---|
 Brock LesnarSelf | Self |
 Frank MirSelf | Self |
 Georges St-PierreSelf | Self |
 Thiago AlvesSelf | Self |
 Dan HendersonSelf | Self |
 Michael BispingSelf | Self |
 Jon FitchSelf | Self |
 Paulo ThiagoSelf | Self |
 Yoshihiro AkiyamaSelf | Self |
 Alan BelcherSelf | Self |
 Mark ColemanSelf | Self |
 Stephan BonnarSelf | Self |
 Jon JonesSelf | Self |
 Jake O'BrienSelf | Self |
 Jim MillerSelf | Self |
 Mac DanzigSelf | Self |
 Kim Dong-hyunSelf | Self |
 TJ GrantSelf | Self |
 Thomas Joseph LawlorSelf | Self |
 C.B. DollawaySelf | Self |
| SShannon GugertySelf | Self |
 Matt GriceSelf | Self |