Mark Harmon is coming back as Gibbs through all of Season 3 of "NCIS: Origins." How will that work? "You'll see," Harmon says.

Mark Harmon last appeared as the character in a November 2025 episode of the prequel series

As news broke that Mark Harmon will be returning as Gibbs for all 10 episodes of NCIS: Origins' third season, another franchise alum is back in the fold.

NCIS: Los Angeles' alum Eric Christian Olsen is returning to the 'NCIS' franchise, joins 'Origins' as executive producer.

NCIS has been on the air since 2003 — and the fan favorite drama is still going strong. The CBS series follows a group of special agents from the Naval Criminal Investigative Service as they investigate various different crimes.

NCIS: Origins fans have received a major casting update they have been waiting for. The update confirms the return of a beloved NCIS star for Season 3. What is the NCIS: Origins casting update? NCIS

Origins for a season-long arc. Harmon, who previously starred as Leroy Jethro Gibbs for 18 seasons on NCIS, will appear in all episodes of Season 3 as part of a present-day mystery tied to his ‘90s Camp Pendleton days.

NCIS fans were thrilled to learn of Harmon’s return.  “This is gonna be good, frankly I’m quite scared but very happy to see Gibbs and baby Gibbs again,” one person wrote on Instagram.  “OMG! This cant be real,