Mark Harmon Returning for "NCIS: Origins" Season 3

Mark Harmon is once again going to reprise his iconic character, Leroy Jethro Gibbs, on the small screen.

Harmon will play the character in a season-long arc of the upcoming third season of the prequel series “NCIS: Origins.”

He is set to appear onscreen in every episode of Season 3 as part of a “present-day mystery tied to his ‘90s Camp Pendleton days in an action-packed story that unfolds all season long.”

Harmon already narrates every episode of “NCIS: Origins” as Gibbs and serves as an executive producer on the series.

He also appeared as the character in a special “NCIS”/”NCIS: Origins” crossover episode that aired in late 2025 and appeared as Gibbs in the prequel’s 2024 pilot.

This will be Harmon's first time playing the character save for those brief appearances since he departed “NCIS” in 2021.

Harmon played Gibbs across 18 seasons of “NCIS,” leaving the show in Season 19.

The mothership show remains a cornerstone of the CBS lineup, with “Origins” set to debut its third season Tuesdays this fall.

Aside from those two shows, CBS also airs “NCIS: Sydney” and is currently prepping “NCIS: New York” starring LL Cool J and Scott Caan.

Past entries in the franchise include “NCIS: New Orleans,” “NCIS: Los Angeles” (in which LL Cool J also starred), “NCIS: Hawaiʻi,” and “NCIS: Tony & Ziva,” the last of which aired on Paramount+.

Austin Stowell stars as a young Gibbs in the prequel during his early days at Camp Pendleton.

The cast also includes Kyle Schmid, Mariel Molino, Tyla Abercrumbie, Diany Rodriguez, and Caleb Foote.

Mark Harmon and his son, Sean Harmon, executive produce along with David J. North, Michele Greco, and Eric Christian Olsen. CBS Studios produces.