Mark Harmon continues his collaboration with former special agent Leon Carroll Jr. in their groundbreaking NCIS book series!

Mark Harmon may have left NCIS, but he'll forever be synonymous with Supervisory Special Agent Leroy Jethro Gibbs. "Mark's always been part of the show, Mark's always going to be part of the show," ...

The upcoming NCIS and NCIS: Origins crossover brings Mark Harmon back onscreen as Leroy Jethro Gibbs, though his presence remains a constant part of the prequel. He serves as an executive producer and ...

One of his first acting roles was in a would-be spinoff of the classic drama.

Mark Harmon will reprise his “NCIS” role of Leroy Jethro Gibbs this week, a return that the TV legend said brought him back to the “tough” early days of the CBS franchise. Tuesday’s crossover event ...

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 ...

Oct. 28 (UPI) --NCIS legend Mark Harmon is to guest star as his character, Leroy Jethro Gibbs, on the prequel, NCIS: Origins, next month. Harmon is heard narrating the 1990s spin-off, which is now in ...

(CBS) - Mark Harmon will make a special guest appearance as Leroy Jethro Gibbs on NCIS: Origins on Nov. 11. Harmon played Gibbs for 18 seasons on NCIS. In the crossover event airing on Veterans Day, ...

His appearance will be part of a crossover between the prequel and the flagship series. By Rick Porter Television Business Editor The crossover will find the younger Gibbs and the NCIS team ...

Mark Harmon’s narration about Ducky As with every episode, Mark Harmon provides the opening and closing narration, and it’s the latter that’s especially emotional. The episode reveals just how Ducky ...

Thanks to his role on "NCIS" and others, Mark Harmon is a legit star in his own right. But he also comes from a family of famous entertainers.