| Brendan Gleeson | Martin Cahill |
| Adrian Dunbar | Noel Curley |
| Sean McGinley | Gary |
| Maria Doyle Kennedy | Frances |
| Angeline Ball | Tina |
| Jon Voight | Inspector Ned Kenny |
| Eanna McLiam | Jimmy |
| Tom Murphy | Willie Byrne |
| Paul Hickey | Anthony |
| Tommy O'Neill | Paddy |
| John O'Toole | Shea |
| Ciaran Fitzgerald | Tommy |
| Ned Dennehy | Gay |
| Vinny Murphy | Harry |
| Roxanna Williams | Orla |
| Eamonn Owens | Young Martin Cahill |
| Colleen O'Neill | Patricia |
Irishman Martin Cahill advances from petty villain to crime lord before being murdered in 1994.
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