Based on the 2002 screenplay "Wu jian dao" by Alan Mak and Felix Chong.

Some copies may have 2 discs; one is the feature film and the other contains the special features.

Director of photography, Michael Ballhaus ; editor, Thelma Schoonmaker ; music, Howard Shore ; costume designer, Sandy Powell ; production designer, Kristi Zea ; visual effects supervisor, Rob Legato.

Leonardo DiCaprio, Matt Damon, Jack Nicholson, Mark Wahlberg, Martin Sheen, Ray Winstone, Vera Farmiga, Anthony Anderson, Alec Baldwin, Kevin Corrigan.

In South Boston, the state police force are waging a war on Irish-American organized crime. Undercover cop Billy Costigan is assigned to infiltrate the mob syndicate, which is run by gangland chief Frank Costello. Billy quickly gains Costello's confidence. Colin Sullivan is a hardened young criminal who has infiltrated the police department as an informer for the syndicate. Colin is rising to a position of power within the Special Investigation Unit. Each man becomes deeply consumed by his double life, gathering information about the plans and counter-plans of the operations he has penetrated. But when it becomes clear to both the mob and the police that there's a mole in their midst, Billy and Colin are suddenly thrust into danger. Afraid of being caught and exposed to the enemy, they each must race to uncover the identity of the other man in time to save himself.

MPAA rating: R; for strong brutal violence, pervasive language, some strong sexual content and drug material.

DVD, region 1, widescreen presentation; Dolby Digital.

English, French or Spanish dialogue, English, French or Spanish subtitles; closed-captioned.

National Board of Review (USA), 2006: NBR - Best Director (Martin Scorsese) ; Best Ensemble.