UFC 63: Hughes vs. Penn was a mixed martial arts event held by the Ultimate Fighting Championship on September 23, 2006. The event, originally subtitled "Hughes vs. St. Pierre," was scheduled to feature a UFC Welterweight Title match between champion Matt Hughes and Georges St.-Pierre. Nevertheless, a groin injury—which was reported early in August—forced St.-Pierre off the card.
| Actor | Role |
|---|---|
 Matt HughesSelf | Self |
 B.J. PennSelf | Self |
 Mike SwickSelf | Self |
 David LoiseauSelf | Self |
 Melvin GuillardSelf | Self |
 Gabe RuedigerSelf | Self |
 Rashad EvansSelf | Self |
 Jason LambertSelf | Self |
 Joe LauzonSelf | Self |
 Jens PulverSelf | Self |
 Roger HuertaSelf | Self |
| JJason DentSelf | Self |
 Eddie SanchezSelf | Self |
| MMario NetoSelf | Self |
 Jorge GurgelSelf | Self |
| DDanny AbbadiSelf | Self |
 Tyson GriffinSelf | Self |
| DDavid LeeSelf | Self |