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

Mark Harmon is set to return to the NCIS universe in a special crossover event uniting NCIS and NCIS: Origins. The upcoming episode brings back his iconic character, Leroy Jethro Gibbs. The storyline connects past and present investigations across both series.

NCIS Season 23 Episode 3 detoured away from the more serious content for a laugh-out-loud hour with the B Team.

Harmon, 74, will make a rare guest appearance on "Origins" as Gibbs, the character he played for 18 "NCIS" seasons, during the first crossover event between the two CBS dramas on Veteran's Day, Nov. 11 (starting 8 ET/PT)

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

NCIS' star Mark Harmon is reprising the role of Leroy Jethro Gibbs in an upcoming Veteran's day crossover episode of 'NCIS: Origins.'

We'll get to see more of modern-day Leroy Jethro Gibbs in the 'NCIS' prequel series — and he's no longer alone!

Mark Harmon is returning to the NCIS universe and he won't be alone! CBS and the beloved actor dropped all the details.

As NCIS: Origins moves forward, fans can expect emotional complexity, professional stakes, and romance that’s both teased and restrained. Gibbs’ journey isn’t just about love — it’s about the making of a leader, a partner, and an agent whose choices reverberate across the franchise.