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 dwindling love for "NCIS" has reportedly pushed the series' former star and executive producer, Mark Harmon, to reconsider his semi-retirement. The Hollywood veteran, per sources, can no longer ...

We're moments away from having Mark Harmon back on our TV screens—and we finally have a sneak peek of what he's up to. "Mark Harmon is back as Gibbs on #NCISOrigins!" the caption read alongside the ...

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 ...

Bestselling Authors Mark Harmon and Leon Carroll, Jr. Return to Release Third Installment, Ghosts of Sicily, from Harper Select on April 14, 2026 From the New York Times bestselling authors and NCIS ...

"NCIS" legend Mark Harmon is bringing his OG Leroy Jethro Gibbs character to the prequel series "NCIS: Origins," and he's not coming alone. Harmon, 74, will make a rare guest appearance on "Origins" ...

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 ...