An ex-marine who struggles to provide for his family and a violent drug dealer with an undefeated fighting record are determined to compete in the Donnybrook, a legendary, bare-knuckle brawl with a cash prize of $100,000.
| Actor | Role |
|---|---|
 Frank GrilloChainsaw Angus | Chainsaw Angus |
 Margaret QualleyDelia Angus | Delia Angus |
 James Badge DaleWhalen | Whalen |
 Jamie BellJarhead Earl | Jarhead Earl |
 Chris BrowningMcGill | McGill |
 Pat HealyEldon | Eldon |
 James Landry HébertPoe | Poe |
 Adam BartleyDote | Dote |
 Dara Jade TillerTammy Earl | Tammy Earl |
 Valerie Jane ParkerSarah | Sarah |
 Kevin CrowleyKelsen | Kelsen |
| DDavid Myers GregoryPurcell | Purcell |
 Rhyan Elizabeth HanavanScout | Scout |
| NNathan NeorrKC | KC |
 Ben AycriggDonnybrook Fighter | Donnybrook Fighter |
 Sean CaseyDonnybrook Fighter | Donnybrook Fighter |
 Nick DeKayDonnybrook Fighter | Donnybrook Fighter |
 Lydia HandDonnybrook Fighter | Donnybrook Fighter |
| GGina DunlapFamily in Park | Family in Park |
 John E. BrownleeFactory Worker (uncredited) | Factory Worker (uncredited) |
| JJerry MullinsFight Spectator (uncredited) | Fight Spectator (uncredited) |