Mark Harmon Returns As Gibbs For ‘NCIS: Origins’ Season 3

TELEVISION NEWS
By Ari Coine
For nearly two decades, Mark Harmon made Leroy Jethro Gibbs one of television’s most recognizable and beloved characters. Gibbs was never the loudest person in the room, but he was almost always the one viewers trusted most. He led with instinct, loyalty and a no-nonsense sense of right and wrong, making him the steady center of NCIS for 18 seasons.Now, Harmon is stepping back into Gibbs’ world in a bigger way. The actor will appear in every episode of NCIS: Origins season 3 this fall, bringing the present-day version of Gibbs into an action-packed mystery connected to his time at Camp Pendleton in the 1990s. The storyline will unfold across the entire season, giving fans another chance to see Harmon play the character who helped turn NCIS into one of television’s biggest franchises. Mark Harmon brings Gibbs back to the screen Harmon’s return is especially meaningful because NCIS: Origins has so far focused on a much younger Gibbs, played by Austin Stowell. The prequel follows Gibbs in the early 1990s, long before he became the seasoned leader fans came to know on NCIS. Harmon has been part of the series from the beginning, serving as an executive producer and narrating each episode. His voice gives the show a connection to the original series, adding the feeling that Gibbs himself is looking back on the choices, losses and cases that helped shape his life. But hearing Harmon as Gibbs is one thing. Seeing him onscreen again is another. He first appeared in the NCIS: Origins series premiere in 2024, then made a special guest appearance during the first crossover event between NCIS and NCIS: Origins in November 2025. Season 3 will take that connection much further, with Harmon appearing throughout the season as the show explores a new mystery from Gibbs’ past. Why Leroy Jethro Gibbs remains a TV favorite There are plenty of iconic TV investigators, but Gibbs stands apart because he always felt human underneath the tough exterior. He could be intimidating. He had rules. He delivered plenty of memorable looks and head slaps. But Gibbs also carried deep grief, protected his team fiercely and never stopped believing that victims deserved justice. Harmon played all of those sides without ever making the character feel forced. That balance is a huge reason Gibbs became such a fan favorite. He was tough without being cold. He was flawed without becoming impossible to root for. And even when he made mistakes, viewers understood where they came from. Gibbs felt like someone who had been through enormous pain but kept showing up because he believed the work mattered. Harmon brought a quiet power to the role that made Gibbs feel larger than life while still keeping him grounded. He did not need a dramatic speech in every scene to command attention. Sometimes a single look said everything. ‘NCIS: Origins’ adds another layer to Gibbs’ story The prequel has given fans the chance to understand the man Gibbs was before the events of NCIS. Austin Stowell has the difficult job of playing a younger version of such an established character, while also making him feel like his own person. With Harmon returning for season 3, NCIS: Origins has an opportunity to connect the past and present in an even more personal way. The Camp Pendleton mystery could reveal new details about Gibbs’ early years while showing how those experiences stayed with him long after. That is what makes this return so exciting. Gibbs’ story has never simply been about solving cases. It has been about survival, loss, family and the choices that define a person. Mark Harmon helped make Leroy Jethro Gibbs a television legend. This fall, fans will get to spend more time with him again. NCIS: Origins season 3 premieres Tuesdays at 10:00 p.m. ET/PT this fall on CBS and will stream on Paramount+.
Mark Harmon, who starred as Leroy Jethro Gibbs for 18 seasons on NCIS, returns for the next chapter in the iconic character’s story this fall. Harmon will appear in all episodes of NCIS: ORIGINS this season as part of a present-day mystery tied to his ‘90s Camp Pendleton days in an action-packed story that unfolds all season long. Season three of NCIS: ORIGINS will air Tuesdays at 10:00 PM, ET/PT this fall on CBS and streaming on Paramount+. Pictured (L-R): Mark Harmon as Leroy Jethro Gibbs. Photo: CBS ©2026 CBS Broadcasting, Inc. All Rights Reserved. Highest quality screengrab available.

Ask anyone who watched NCIS through the 2000s and 2010s, and Leroy Jethro Gibbs comes up fast. Mark Harmon played him for the better part of twenty years. He never shouted to get noticed. He didn’t have to. Viewers leaned in anyway, because Gibbs ran on instinct, loyalty, and a stubborn streak about right and wrong that never bent. For 18 seasons, he was the thing holding the whole show together.

So the news that he’s back? Bigger deal than it sounds. And no, not a blink-and-you-miss-it walk-on this round.

Mark Harmon Returns as Gibbs in NCIS: Origins Season 3

The short version: every episode this fall. Mark Harmon returns as Gibbs in NCIS: Origins season 3, and he’s there from the premiere through the finale. The hook is a present-day case that reaches back to his Camp Pendleton years in the 1990s. Since it runs the length of the season, fans finally get more than a teaser. Last fall’s crossover gave us a taste. This gives us the meal. We’re talking about the guy who turned NCIS into a franchise that just keeps spawning spinoffs, parked at the center of the show again.

There’s a reason it lands harder than your average guest spot. NCIS: Origins has built its first two seasons around a younger Gibbs, with Austin Stowell in the role. The whole thing is set in the early ’90s, long before Leroy Jethro Gibbs grew into the weathered team leader people know.

Mark Harmon has had a hand in the prequel from the jump as an executive producer. He narrates every episode too, that low, sandpaper voice tying the show back to where it all came from. It’s almost like an older Gibbs sitting back, sorting through the cases and the losses that left a mark.

Narrating a show, though, is a long way from standing in front of the camera on it.

He’s done the on-camera thing twice so far. Once in the 2024 premiere, then again in that NCIS/NCIS: Origins crossover back in November 2025. Season 3 is a different animal. This time Mark Harmon returns as Gibbs for a full run, while the writers crack open a new chapter of his past.

Why Leroy Jethro Gibbs Remains a TV Favorite

Crime TV has never been short on hard-nosed investigators. Gibbs stuck because he felt like a person, not a type.

Yeah, the rules. The stare. The occasional head slap. All part of the package. But Leroy Jethro Gibbs also dragged around a lot of grief, threw himself in front of his team when it counted, and flat-out refused to stop fighting for victims. Mark Harmon made all of that read as true. Never once did it feel like he was acting it.

That’s why people held onto the character. Hard, but not heartless. Messy, but you stayed in his corner. Even when he blew a call, it tracked, because Gibbs carried himself like a man who’d already been through the worst and showed up anyway. The job meant something to him. Simple as that.

What Mark Harmon gave the role was quiet weight. Huge presence, almost no fuss. He could own a scene without a single line. Half the time, the look said it.

NCIS: Origins Camp Pendleton Mystery Adds a New Layer

What the prequel has done is let us watch the Gibbs who existed before any of the NCIS stuff happened. No easy gig for Austin Stowell, who has to deliver a younger version of a character everybody already loves and still carve out something of his own.

That’s where this season gets interesting. With Mark Harmon returns as Gibbs finally happening across a full run, NCIS: Origins can stitch the two eras together in a way that actually means something. The Camp Pendleton mystery might dig up fresh details about his early days and show how long those ghosts hung around.

And honestly, that’s the whole pull. Gibbs’ story was never just whodunits and cold cases. It was survival, family, loss, and the small choices that quietly add up to a person.

Mark Harmon turned Leroy Jethro Gibbs into a legend. This fall, fans get a whole season back in his company.

NCIS: Origins season 3 premieres Tuesdays at 10:00 p.m. ET/PT this fall on CBS and streams on Paramount+.

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