Tired of the crime overrunning the streets of Boston, Irish Catholic twin brothers Conner (Sean Patrick Flanery) and Murphy (Norman Reedus) are inspired by their faith to cleanse their hometown of evil with their own brand of zealous vigilante justice. As they hunt down and kill one notorious gangster after another, they become controversial folk heroes in the community. But Paul Smecker (Willem Dafoe), an eccentric FBI agent, is fast closing in on their blood-soaked trail.
Will Hunting (Matt Damon) has a genius-level IQ but chooses to work as a janitor at MIT. When he solves a difficult graduate-level math problem, his talents are discovered by Professor Gerald Lambeau (Stellan Skarsgard), who decides to help the misguided youth reach his potential. When Will is arrested for attacking a police officer, Professor Lambeau makes a deal to get leniency for him if he will get treatment from therapist Sean Maguire (Robin Williams).