who plays agent callen on ncis los angeles
G. Callen G. Callen (born: Grisha Alekandrovich Nikolaev) is a fictional character in the show NCIS: Los Angeles portrayed by Chris O'Donnell. He is an NCIS Special Agent in Charge, and the senior agent assigned to the Office of Special Projects. O'Donnell made his first appearance during NCIS' sixth season episode "Legend (Part 1)".
NCIS: Los Angeles 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,[2] and stars Chris O'Donnell and LL Cool J. The series follows the exploits of the Los Angelesâ€“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.[3][4][5][6][7] On March 23, 2017, CBS renewed the series for a ninth season which premiered on October 1, 2017.[8] Nia Long joined the cast as Shay Mosley for the ninth season[9][10][11] after Miguel Ferrer's death.[12][13][14] On April 18, 2018, CBS renewed the series for a tenth season,[15] which premiered on September 30, 2018.[16]