<Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Td_colspan="2"> Official website </Td> </Tr> <P> NCIS: Los Angeles is an American action television series combining elements of the military drama and police procedural genres, which premiered on CBS 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 (OSP), an elite division of the Naval Criminal Investigative Service that specializes in undercover assignments . NCIS: Los Angeles is the first spin - off of the successful series NCIS . On March 23, 2017, CBS renewed the series for a ninth season which premiered on October 1, 2017 . Nia Long joined the cast as Shay Mosley for the ninth season after Miguel Ferrer's death . On April 18, 2018, CBS renewed the series for a tenth season, which premiered on September 30, 2018 . </P> <P> NCIS: Los Angeles follows Special Agent G. Callen (Chris O'Donnell), a "legend" assigned to the Office of Special Projects (OSP), a fictitious branch of the Naval Criminal Investigative Service (the real - life NCIS has no offices in Los Angeles). Callen leads an elite team of undercover operatives as they battle enemies both foreign and domestic under the watchful eye of Operational Manager Henrietta "Hetty" Lange (Linda Hunt). The team is composed of Agent Kensi Blye (Daniela Ruah), a hand - to - hand combat specialist and forensic whiz, Sam Hanna (LL Cool J), a former Navy SEAL and G's partner, technical analyst Eric Bartholomew Beale III (Barrett Foa), and ranking team member Shay Mosley (Nia Long), NCIS Executive Assistant Director for Pacific Operations (EAD - PAC). </P>

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