Mark Harmon to Appear in Every Episode of NCIS: Origins Season 3, Officially Confirmed

Mark Harmon, the iconic star of the NCIS franchise, will make a recurring on-screen appearance in every episode of NCIS: Origins Season 3, according to an official announcement by CBS. The actor, who portrayed Leroy Jethro Gibbs for nearly two decades on the original NCIS series, will reprise the role as the older version of the character for a season-long story arc, marking his first major on-screen involvement since leaving the main series in 2021.

Why Is Mark Harmon Returning to NCIS: Origins?

Harmon’s return to NCIS: Origins is tied to a present-day mystery that intersects with the 1990s timeline of the prequel series. The show, which stars Austin Stowell as a younger Gibbs, explores the early career of the legendary NCIS agent. A scene from Season 2 hinted at an unresolved case involving a naval officer’s death, which is now being reexamined in the present day. “This story allows us to bridge the past and present in a way that honors Gibbs’ legacy while introducing new layers to his character,” said CBS in a statement.

What’s the Plot of NCIS: Origins Season 3?

The third season of NCIS: Origins will delve into a mystery that connects the 1990s investigations led by young Gibbs with a modern-day investigation. The narrative is designed to highlight the older Gibbs’ influence on his younger self, with Harmon’s character serving as a narrative anchor. “It’s a unique challenge to portray a character who’s both a mentor and a reflection of the past,” Stowell told Entertainment Weekly in a 2024 interview. “Mark’s presence adds a level of authenticity that’s invaluable.”

How Will Mark Harmon’s Role Differ From Previous Appearances?

Harmon has previously made brief appearances as the older Gibbs in NCIS: Origins, but Season 3 will mark his most significant on-screen role since his exit from the original NCIS series. The actor also serves as an executive producer for the prequel, giving him creative input on the storyline. “This is a chance to explore Gibbs’ origins in a way that feels both nostalgic and fresh,” Harmon said in a recent interview with TV Guide. “It’s a tribute to the fans who’ve followed the character for so long.”

When Will NCIS: Origins Season 3 Air?

NCIS: Origins Season 3 is set to debut during the Fall 2026-27 television season, following the show’s successful premiere in 2024. The prequel, created by Gina Lucita Monreal and David J. North, has already garnered praise for its faithful adaptation of Gibbs’ early career. The season will feature a rotating cast of directors, including Niels Arden Oplev and Hanelle M. Culpepper, and will continue to star Austin Stowell as the younger Gibbs alongside Kyle Schmid as Mike Franks.

What Does This Mean for the NCIS Franchise?

Harmon’s return underscores the enduring popularity of the NCIS universe, which has remained a cornerstone of CBS’s programming for over two decades. The prequel’s focus on Gibbs’ origins provides a fresh angle for longtime fans while attracting new viewers. “This is a strategic move to expand the NCIS brand while maintaining its core appeal,” said media analyst Sarah Lin in a 2024 analysis for Deadline. “Harmon’s involvement ensures continuity and credibility.”