There are new details about the upcoming NCIS: Origins crossover episode with NCIS !

Mark Harmon will appear in the November 11 episode of the CBS spinoff series, reprising his role as Leroy Jethro Gibbs.

The crossover event includes a one-time timeslot change: NCIS: Origins airs first at 8 p.m. ET/PT, followed by NCIS airing at 9 p.m. ET/PT for Part 2.

The Origins half of the episode will feature the younger Gibbs ( Austin Stowell ) and the team investigating the small-town death of a naval officer in the ‘90s. The case will then get reopened in present day NCIS for Part 2.

After appearing in the pilot episode last year, this will be Mark ‘s first on-screen return after playing the role for 18 years on the main series. (He also provides voiceover on the

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