Sean Harmon (born April 25, 1988) is an American actor and also the son of NCIS series regular Mark Harmon, with Sean playing a younger version of his father's character, Leroy Jethro Gibbs, in 6 episodes.

Sean also appeared in NCIS: Los Angeles, guest-starring in the NCIS: Los Angeles Season 6 episode Rage (episode) as Charlie Connor.

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