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

Mark Harmon is set to return to the NCIS universe in a special crossover event uniting NCIS and NCIS: Origins. The upcoming ...

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

Mark Harmon is set to return to the NCIS universe in a special crossover event uniting NCIS and NCIS: Origins. The upcoming ...

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

"NCIS: Origins" will catch up with present-day Leroy Jethro Gibbs as part of its big crossover with the flagship series in ...

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 to guest star as his character, Leroy Jethro Gibbs, on the prequel, "NCIS: Origins," next month.

Good news for NCIS fans! Mark Harmon will reprise his iconic Leroy Jethro Gibbs role in the flagship series. His return will ...

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

The crossover event begins on Origins will Gibbs ( Austin Stowell) and the NIS team investigating the small-town death of a ...

But arguably the biggest reveal came with learning why Ducky talks to bodies, which we saw the late David McCallum did when ...