As already mentioned, we’ve known that Harmon’s voice will be present throughout NCIS: Origins since the older Gibbs will be recounting his early time working for the title law enforcement agency, known back then as NIS.

The protagonist of 19 seasons of "NCIS" returns to his character's origin story.The NCIS-verse has expanded, and Mark Harmon is still along for the ride.CBS announced in January that a sixth spinoff series of the long-running military-police procedural was on its way,

While it was previously announced that Harmon would return as older Gibbs to narrate the series, NCIS: Origins co-showrunner David J North has now confirmed that he will also make a brief appearance in the pilot episode.

NCIS: ORIGINS, the upcoming spinoff of NCIS, focuses on the life of young Agent Gibbs, originally played by Mark

The actor played Leroy Jethro Gibbs on 'NCIS' from 2003 to 2021Mark Harmon will be on hand to help introduce Leroy Jethro Gibbs' backstory.The actor, 73, who portrayed Gibbs on NCIS  from 2003 to 2021,

It’s not supposed to be about old Leroy Gibbs — this is about his younger self coming up in the Naval Criminal Investigative Service — but Mark Harmon will appear briefly in the premiere episode of NCIS: Origins.

There have been a lot of questions about whether Mark Harmon would ever return to NCIS. Well, we finally have a positive answer to the question. Harmon played Gibbs in the flagship series from the beginning.

Mark Harmon is set to make his first onscreen appearance as NCIS fan-favorite character Leroy Jethro Gibbs in three years.

In a surprising turn of events, Mark Harmon will reprise his iconic role as Jethro Gibbs in NCIS: Origins after his last portrayal in 2021.