Mark Harmon, who spent 18 seasons on "NCIS," is reprising his role as special agent Leroy Jethro Gibbs for a crossover event.

NCIS Season 23 Episode 4 is titled Gone Girls and it will air on November 4 on CBS.

Fans will finally be able to see Mark Harmon's grand return to the part of Leroy Jethro Gibbs in an ambitious crossover ...

Harmon will return in the flesh for a special crossover event on Tuesday, Nov. 11. For one night only, “NCIS” and “NCIS: ...

NCIS alum Mark Harmon is set to return to the long-running CBS series for a special crossover event between the procedural ...

Mark Harmon is making an on-screen return to the NCIS universe. Harmon will guest star in an episode of NCIS: Origins on Nov.

Origins to make a cameo appearance as Gibbs. Find out when to expect to see him make his second appearance on the series.

Mark Harmon will return to NCIS as Gibbs in CBS’ epic NCIS x NCIS: Origins crossover event episodes. Here’s what we know.

When Mark Harmon departed NCIS in 2021, it took three years before he returned onscreen as his fan-favorite character, Leroy ...

NCIS legend Mark Harmon revealed what initially drew him to the long-running naval procedural drama — and explained what ...