To take down South Boston's Irish Mafia, the police send in one of their own to infiltrate the underworld, not realizing the syndicate has done likewise. While an undercover cop curries favor with the mob kingpin, a career criminal rises through the police ranks. But both sides soon discover there's a mole among them.
Lies. Betrayal. Sacrifice. How far will you take it?
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Jack NicholsonFrancis 'Frank' Costello
Leonardo DiCaprioWilliam "Billy" Costigan, Jr.
Matt DamonStaff Sgt. Colin Sullivan
Mark WahlbergStaff Sgt. Sean Dignam
Vera FarmigaDr. Madolyn Madden
Martin SheenCapt. Oliver Charles Queenan
Ray WinstoneArnold "Frenchy" French
Anthony AndersonTrooper Brown
Alec BaldwinCapt. George Ellerby
Kevin CorriganCousin Sean
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