The twelfth season of NCIS (Naval Criminal Investigative Service) starring Mark Harmon, Michael Weatherly, and Pauley Perrette continues to follow the unlikely team of special agents who are forced to put their differences aside in dealing with a continuous onslaught of life-and-death situations ranging from murder, espionage, and terrorism on the high seas. Alex Veadov plays the series' main nemesis, Sergei Mishnev, the brother of a Russian terrorist previously thwarted by the NCIS crew. All 24 episodes of season 12 are contained in this exclusive set.