Cops and criminals get equal attention in HBO's acclaimed drama, and Season 2 delves even deeper into Baltimore's corruption. This season, McNulty and Daniels monitor Frank Sobotka's activities at the docks; a wiretap reveals an international smuggling ring; and Stringer helps Proposition Joe make inroads into new drug-dealing territory. Idris Elba, John Doman, Seth Gilliam, Larry Gilliard Jr., Wood Harris, Lance Reddick and Andre Royo star.