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Season Mark Harmon

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Mark Harmon Returning To ‘NCIS: Origins’ As Gibbs For Season 3

Mark Harmon is returning to NCIS: Origins for a season-long arc. Harmon, who previously starred as Leroy Jethro Gibbs for 18 seasons on NCIS, will appear in all episodes of Season 3 as part of a present-day mystery tied to his ‘90s Camp Pendleton days.