NCIS: Los Angeles is an American action television series combining elements of the military drama and police procedural genres, which premiered on the CBS network on September 22, 2009, and stars Chris O'Donnell and LL Cool J. The series follows the exploits of the Los Angeles-based Office of Special Projects, an elite division of the Naval Criminal Investigative Service that specializes in undercover assignments.
To go "undercover" is to avoid detection by the entity one is observing, and especially to disguise one's own identity or use an assumed identity for the purposes of gaining the trust of an individual or organization to learn or confirm confidential information or to gain the trust of targeted individuals in order to gather information or evidence.
A television program is a segment of content intended for broadcast on over-the-air, cable television, or Internet television, other than a commercial, trailer, or any other segment of content not serving as attraction for viewership.
Los Angeles, officially the City of Los Angeles and often known by its initials L.A., is the second-most populous city in the United States, the most populous city in California and the county seat of Los Angeles County.
NCIS: Los Angeles is the first spin-off of the successful series NCIS.
On March 25, 2016, CBS renewed the series for an eighth season, which premiered on September 25, 2016.