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Mark Harmon will make a full-time return to the NCIS-verse in the 2026-27 season.
Harmon will appear on screen in every episode of prequel series NCIS: Origins, reprising his long-time NCIS role of Leroy Jethro Gibbs in addition to narrating and executive producing the series. Harmon guest-starred on the show last season as part of a crossover with NCIS that spanned the prequel’s 1990s setting and the present-day world of the flaghship series. He also appeared in the series premiere in 2024.
Season three of Origins will take a similar approach, minus the crossover: It will feature Harmon as part of a present-day mystery that connects to Gibbs’ time at Camp Pendleton in the ’90s and spans the entire season. That heavily serialized element is also something of a departure for the NCIS franchise, which has built a library of more than 1,100 episodes across seven series (with an eighth, NCIS: New York, on the way) mostly on the back of self-contained procedural stories.
CBS announced Harmon’s return in a social media post Tuesday; see it below.
