Mark Harmon is making an on-screen return to the NCIS universe.

Harmon will guest star in an episode of NCIS: Origins on Nov. 11, reprising his longtime character Leroy Jethro Gibbs. The episode will be part of a crossover with NCIS , following a case that spans the 1990s-set Origins and the present-day setting of the flagship series.

Harmon is an executive producer on both shows and the narrator of Origins . He had a cameo in the prequel’s series premiere — which follows a younger version of the character (played by Austin Stowell) — last year, but the Nov. 11 episode will be Harmon’s first substantial on-camera work as Gibbs since he left NCIS in October 2021.

Mark Harmon is making an on-screen return to the NCIS universe.

Harmon will guest star in an episode of

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