Warner Bros.The Bad Cop: Colin Sullivan (Matt Damon) is a talented officer in Bostons State Police Department. Hes also a rat. Sullivan was groomed at a young age by Irish mobster Frank Costello (Jack Nicholson) to serve as a personal informant within the police department. Sullivan keeps his fellow cops off of Costellos back, while searching for the undercover cop (Leonardo DiCaprio) in his boss' crew. Most Corrupt Act: Sullivan's criminal acts start merely as obstruction of justice, but he really gets his hands dirty when he directly causes the death of a police captain (Martin Sheen). Sensing that Costellos luck is running out, he betrays his mentor and kills him. He soon finds head on the chopping block when DiCaprios cop uncovers his double life, but Sullivan is spared when his crooked partner offs DiCaprio. As a way to show his gratitude, Sullivan puts a bullet in his partners head, thus covering all his tracks. Is Justice Served? Sullivan is an expert deceiver and manages to lie his way out of yet another sticky situation. He seems to have gotten away with everything until he returns to his apartment to find Mark Wahlbergs vengeful cop waiting for him. The man who can talk himself out of anything hardly gets a word out before Marky Mark delivers some street justice.
