Documentarians follow Derek Dallas Junior II and his team of mates—The Underbogs—as they prepare for 'The Dunny Derby Championships sponsored by Quilton'.
| Actor | Role |
|---|---|
 Matthew CaffoeDerek Dallas Junior II | Derek Dallas Junior II |
| AAlan FletcherThe Duke | The Duke |
 Peter ThurnwaldDamo | Damo |
 Jordan Abbey-YoungJacob | Jacob |
 Nicolas AngelosantoAntony | Antony |
| TTristan BarrMax | Max |
 Tim AppletonJosh | Josh |
 Charles CottierShane Mariano | Shane Mariano |
 Michael DeedTrav | Trav |
| PPaul GeogheganOld Fart | Old Fart |
| TTim MagerEddie | Eddie |
 Shuang HuKeitha | Keitha |