The veteran actor, 74, will be guest starring in the first-ever NCIS and NCIS: Origins crossover event on Tuesday, Nov. 11.

The original Leroy Jethro Gibbs is about to make a comeback. Mark Harmon is set to reprise the role he played for 18 seasons ...

NCIS” legend Mark Harmon is bringing his OG Leroy Jethro Gibbs character to the prequel series “NCIS: Origins,” and he’s not ...

Gibbs gets a visitor at Camp Pendleton from DC Headquarters in a new NCIS: Origins Season 2, Episode 3 sneak peek. See the ...

As NCIS: Origins moves forward, fans can expect emotional complexity, professional stakes, and romance that’s both teased and ...

In the first look at Harmon’s return, his present-day version of Gibbs is seen pouring himself a drink. This marks a rare ...

Mark Harmon will make a guest appearance asa Leroy Jethro Gibbs in the November 11 episode of 'NCIS: Origins.' ...

Harmon, 74, will make a rare guest appearance on "Origins" as Gibbs, the character he played for 18 "NCIS" seasons, during ...

Mark Harmon will reprise his role as Leroy Jethro Gibbs in the first hour of the NCIS and NCIS: Origins crossover event airing on November 11. The crossover storyline begins in the 1990s with Gibbs ...

Mark Harmon is reprising his NCIS role as Leroy Jethro Gibbs, and we don't mean as just a voice on NCIS: Origins. The actor will appear during the first-ever crossover event between the two CBS shows, ...

"Great News" and "Mixology" alum Adam Campbell told UPI he was honored to reprise his "NCIS" character on this week's episode ...