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Mark Harmon to Guest Star on 'NCIS: Origins'

  • On Nov. 11, Mark Harmon will reprise Leroy Jethro Gibbs on NCIS: Origins in the first crossover with NCIS, CBS announced on Tuesday, October 28.
  • The crossover's dual timelines, featuring younger Leroy Jethro Gibbs and the NCIS team, investigate a 1990s naval-officer death reopened in the present.
  • Harmon, who is an executive producer and narrator, serves as executive producer and narrator on NCIS: Origins and briefly cameoed in the prequel's pilot last year.
  • The crossover swaps timeslots on Nov. 11, with NCIS: Origins airing at 8 p.m. ET/PT and NCIS at 9 p.m. ET/PT, streaming on Paramount+; Harmon's return is his first substantial Gibbs appearance since October 2021.
  • Season two will deepen Camp Pendleton lore and Gibbs' early career, as co-showrunners David J. North and Gina Lucita Monreal hint `Gibbs is no longer alone.
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The Killeen Daily HeraldThe Killeen Daily Herald
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Mark Harmon to Return as Gibbs in ‘NCIS’ & ‘Origins’ Crossover: See Photo

Harmon left the mothership in Season 19 but narrates the prequel.

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TVLine broke the news in on Tuesday, October 28, 2025.
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