Trey Parker and Matt Stone celebrate South Park's 25th anniversary with a concert in Colorado, featuring Primus and Ween.
| Actor | Role |
|---|---|
 Trey ParkerSelf | Self |
 Matt StoneSelf | Self |
 Les ClaypoolSelf (Primus) | Self (Primus) |
| LLarry LaLondeSelf (Primus) | Self (Primus) |
| TTim AlexanderSelf (Primus) | Self (Primus) |
 Gene WeenSelf (Ween) | Self (Ween) |
 Dean WeenSelf (Ween) | Self (Ween) |
| GGlenn McClellandSelf (Ween) | Self (Ween) |
| CClaude ColemanSelf (Ween) | Self (Ween) |
| DDave DreiwitzSelf (Ween) | Self (Ween) |
 Geddy LeeSelf (Rush) | Self (Rush) |
 Alex LifesonSelf (Rush) | Self (Rush) |
 Bruce HowellLead Guitar | Lead Guitar |
| JJoanne Javieh CoudrietBackground Vocals | Background Vocals |
| GGabriela HankinsBackground Vocals | Background Vocals |
| AAshley MonizBackground Vocals | Background Vocals |
| NNatalie WachenBackground Vocals | Background Vocals |
| JJordan PowersBackground Vocals | Background Vocals |
 Carly Thomas SmithBackground Vocals | Background Vocals |
| JJohn A. Hansen Jr.Mr. Slave | Mr. Slave |
| GGraham BowenTap Dancer | Tap Dancer |
 Stanley G. SawickiCatatafish | Catatafish |
| KKurt NickelsSparrow Prince | Sparrow Prince |
| MMcKenzie MarshallFrog King | Frog King |
| BBetty Boogie ParkerHarper (uncredited) | Harper (uncredited) |