NCIS is an American police procedural television series that follows a fictional team of special agents from the Naval Criminal Investigative Service. The show combines elements of military drama and police procedural genres. The concept and characters were first introduced in two episodes of the CBS series JAG (season eight, episodes 20 and 21: “Ice Queen” and “Meltdown”). A spin-off from JAG, the series premiered on September 23, 2003, on CBS. It has since completed twenty full seasons and is syndicated on the USA Network. Donald P. Bellisario and Don McGill are the co-creators and executive producers of this inaugural series in the NCIS franchise. As of 2022, NCIS is the third-longest-running scripted, non-animated U.S. primetime TV series currently airing, surpassed only by Law & Order: Special Victims Unit (1999–present) and Law & Order (1990–2010; 2022–present). It ranks as the seventh-longest-running scripted U.S. primetime TV series overall.