Mark Harmon is as soon as once more going to play Leroy Jethro Gibbs on the small display. Selection has discovered that Harmon will play the long-lasting character in a season-long arc of the upcoming third season of prequel collection “NCIS: Origins.”
Per CBS, Harmon will seem onscreen in each episode of Season 3 as a part of a “present-day thriller tied to his ‘90s Camp Pendleton days in an action-packed story that unfolds all season lengthy.”
Harmon already narrates each episode of “NCIS: Origins” as Gibbs and serves as an government producer on the collection. He additionally appeared because the character in a particular “NCIS”/”NCIS: Origins” crossover episode that aired in late 2025 and appeared as Gibbs within the prequel’s 2024 pilot. Nonetheless, he has not performed the character save for these transient appearances since he departed “NCIS” in 2021.
Harmon performed Gibbs throughout 18 seasons of “NCIS,” leaving the present in Season 19. The mothership present stays a cornerstone of the CBS lineup, with “Origins” set to debut its third season Tuesdays this fall. Except for these two reveals, CBS additionally airs “NCIS: Sydney” and is presently prepping “NCIS: New York” starring LL Cool J and Scott Caan.
Previous entries within the franchise embody “NCIS: New Orleans,” “NCIS: Los Angeles” (by which LL Cool J additionally starred), “NCIS: Hawaiʻi,” and “NCIS: Tony & Ziva,” the final of which aired on Paramount+.
Austin Stowell stars as a younger Gibbs within the prequel throughout his early days at Camp Pendleton. The solid additionally contains Kyle Schmid, Mariel Molino, Tyla Abercrumbie, Diany Rodriguez and Caleb Foote. Mark Harmon and his son, Sean Harmon, government produce together with David J. North, Michele Greco and Eric Christian Olsen. CBS Studios produces.

