Mark Harmon, who starred as Leroy Jethro Gibbs for 18 seasons on “NCIS,” returns for the next chapter in the iconic character’s story this fall. Harmon will appear in all episodes of “NCIS: Origins” this season as part of a present-day mystery tied to his ‘90s Camp Pendleton days, unfolding throughout the season in an action-packed story.
Harmon, who serves as executive producer on the series, also narrates each episode.
He previously appeared onscreen as Gibbs in the “NCIS: Origins 2024” series premiere and made a special guest appearance during the first crossover event between “NCIS” and “NCIS: Origins” in November 2025.
“NCIS: Origins” follows a young Leroy Jethro Gibbs (Austin Stowell) in the early ‘90s, years prior to the events of NCIS, and is narrated by Harmon. Also starring Kyle Schmid, Mariel Molino, Tyla Abercrumbie, Diany Rodriguez, and Caleb Foote.
“NCIS: Origins” season three executive producers are David J. North, Mark Harmon, Sean Harmon, Michele Greco and Eric Christian Olsen.
“NCIS: Origins” is produced by CBS Studios.
Season three of “NCIS: Origins” will air Tuesdays at 10:00 PM, ET/PT, this fall on CBS and streaming on Paramount+.
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