NCIS - Fztvseries NCIS NCIS (promoted as Navy NCIS in season one), aka Navy NCIS: Naval Criminal Investigative Service or NCIS: Naval Criminal Investigative Service, is an American police procedural television series revolving around a fictional team of special agents from the Naval Criminal Investigative Service, which conducts criminal investigations involving the U.S. Navy and Marine Corps. Last Updated: 10 March 2010
