Four years after leaving the “NCIS” franchise, Mark Harmon is reprising his role as Leroy Jethro Gibbs on an upcoming episode of “NCIS: Origins.”

Harmon provides narration for “NCIS: Origins,” which is a prequel to “NCIS” set in the early 1990s. Austin Stowell stars as a younger version of Harmon’s character, Gibbs.

Harmon will return in the flesh for a special crossover event on Tuesday, Nov. 11. For one night only, “NCIS” and “NCIS: Origins” are swapping time slots; the spinoff will air first at 8 p.m. ET, followed by the original series.

Per the synopsis, the Nov. 11 episode follows young Gibbs and his team as they “investigate the small-town death of a naval officer in the ’90s on ‘NCIS: Origins,’ a case that’s unexpectedly re-opened in the present day on ‘NCIS.’”

Co-showrunners Da

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