Origins star Austin Stowell and NCIS star Wilmer Valderrama to discuss the first-ever prequel crossover event in Episode 5 of both series, ...
Mark Harmon will make a full-time return to the 'NCIS'-verse, reprising his role as Leroy Jethro Gibbs in the 2026-27 season.
Mark Harmon is going to be in every episode of the prequel's third season.
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