
On February 21, 2023, NCIS was renewed for a 21st season. during the 2012–13 network television season. At the end of its 10th season, the series was the most-watched television series in the U.S. In 2011, NCIS was voted America's favorite television show in an online Harris Poll. Though initially slow in the ratings, barely cracking the top 30 in the first two seasons, the third season showed progress, consistently ranking in the top 20, and by its sixth season, it became a top-five hit, having remained there since. A two-part episode during the 11th season led to a second spin-off series, NCIS: New Orleans. In season six, a two-part episode led to a spin-off series, NCIS: Los Angeles. The series originally had the partly redundant title Navy NCIS: Naval Criminal Investigative Service this was later shortened to NCIS: Naval Criminal Investigative Service and then to NCIS. primetime TV series currently airing, surpassed only by Law & Order: Special Victims Unit (1999–present) and Law & Order (1990–2010 2022–present) it is the seventh-longest running scripted U.S. As of 2022, NCIS is the third-longest-running scripted, non-animated U.S. Bellisario and Don McGill are co-creators and executive producers of the premiere member of the NCIS franchise.

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To date, it has entered into the 20th full season and has gone into broadcast syndication on the USA Network. A spin-off from JAG, the series premiered on September 23, 2003, on CBS.

The concept and characters were initially introduced in two episodes of the CBS series JAG ( season eight episodes 20 and 21: " Ice Queen" and "Meltdown"). The series revolves around a fictional team of special agents from the Naval Criminal Investigative Service, combining elements of the military drama, police procedural genres, and comedy.

NCIS is an American police procedural television series, and the first instalment in the NCIS television franchise.
