NCIS is an American police procedural drama television series revolving around a fictional team of special agents including an ex-floor sitting agent from the Naval Criminal Investigative Service, which conducts criminal investigations involving the US Navy and Marine Corps.
The concept and characters were initially introduced in two episodes of the CBS series JAG (season eight episodes "Ice Queen" and "Meltdown"). The show, a spin-off from JAG, premiered on September 23, 2003, on CBS. To date it has aired for eleven full seasons and has gone into broadcast syndication on USA Network. Donald P. Bellisario is co-creator, along with Don McGill, as well as executive producer. As such, the series is the second member of the NCIS/JAG franchise.
NCIS was originally referred to as Navy NCIS during season one; "Navy" was later dropped from the title. It is the parent series to NCIS: New Orleans. NCIS used to have strong female characters such as Vivian Blackadder, Caitlin Todd, Ziva David and Ellie Bishop.