In 1920s Ireland young doctor Damien O'Donovan prepares to depart for a new job in a London hospital. As he says his goodbyes at a friend's farm, British Black and Tans arrive, and a young man is killed. Damien joins his brother Teddy in the Irish Republican Army, but political events are soon set in motion that tear the brothers apart.
| Actor | Role |
|---|---|
 Cillian MurphyDamien | Damien |
 Pádraic DelaneyTeddy | Teddy |
 Liam CunninghamDan | Dan |
 Orla FitzgeraldSinead | Sinead |
| MMary O'RiordanPeggy | Peggy |
| MMary MurphyBernadette | Bernadette |
| LLaurence BarryMicheail | Micheail |
 Damien KearneyFinbar | Finbar |
 Frank BourkeLeo | Leo |
| MMyles HorganRory | Rory |
| MMartin LuceyCongo | Congo |
 Aidan O'HareSteady Boy | Steady Boy |
 Shane CaseyKevin | Kevin |
| JJohn CreanChris | Chris |
| MMáirtín de CógáinSean | Sean |
 Keith DunphyTerence | Terence |
| KKieran HegartyFrancis | Francis |
| GGerard KearneyDonacha | Donacha |
| SShane NottNed | Ned |
| KKevin O'BrienTim | Tim |
| GGary McCarthyVolunteer | Volunteer |
| TTim O'MahonVolunteer | Volunteer |
| GGraham BrowneVolunteer | Volunteer |
| OOwen BuckleyVolunteer | Volunteer |
| AAidan FitzpatrickVolunteer | Volunteer |
| VVince HanningtonVolunteer | Volunteer |
| DDenis KelleherVolunteer | Volunteer |
| CColin McCleryVolunteer | Volunteer |
| FFinbar O'MahonVolunteer | Volunteer |
| JJohn QuinlanVolunteer | Volunteer |