Black Mass is a crime drama film featuring Benedict Cumberbatch as Billy Bulger, a prominent politician in Boston. The movie tells the true story of James 'Whitey' Bulger, a notorious gangster and brother of Billy Bulger. Cumberbatch showcases his versatility as an actor, portraying a morally conflicted character caught between loyalty to his brother and his political ambitions. Black Mass is a gripping and intense film that delves into the dark underbelly of organized crime and the complexities of family ties.