Mark Harmon is finally stepping back into the role of Leroy Jethro Gibbs in a much bigger way. Beginning October 6, 2026, when NCIS: Origins Season 3 premieres in the U.S., the actor will be part of a season-long storyline rather than simply popping up for a quick appearance that gives longtime fans something to talk about.
That makes this return a pretty big deal for the NCIS franchise. Gibbs has been gone from the main series since 2021, but the character has never really disappeared. Origins found a clever way to keep Harmon involved by having him narrate the story as the older Gibbs, while Austin Stowell plays Gibbs during his early years in the 1990s. Season 3 is changing that setup, though. This time, both versions of Gibbs will be important to the story, with the two timelines connected by a mystery that goes all the way back to his days at Camp Pendleton.
Where We Left Gibbs
To understand why this return matters, it helps to remember where Gibbs was when we last saw him regularly on NCIS. In Season 19, the episode “Great Wide Open” took Gibbs and Timothy McGee to Alaska for a case, and by the time it was over, Gibbs had made a decision that surprised just about everyone. He wasn’t going back to Washington.
There wasn’t some new assignment waiting for him or a secret mission that forced him to stay. Gibbs simply decided that Alaska was where he wanted to be. After everything he’d been through over the years—including the deaths of his first wife Shannon and their daughter Kelly, the countless people he’d lost at NCIS, and his growing frustration with the bureaucracy surrounding the job—he finally seemed to find a little peace away from all of it.
Importantly, NCIS didn’t kill him off. There was no dramatic final sacrifice or heartbreaking goodbye where everyone had to mourn Gibbs. He was alive, retired and somewhere in Alaska, which left the door open for Mark Harmon to return if the right story ever came along. Harmon remained involved with the franchise behind the scenes as an executive producer, and he also became the narrator of Origins. There have been a few brief appearances since then, but nothing that really put Gibbs back in the middle of the story.
That changes with Season 3.
What Pulls Gibbs Back Into the Mystery?
The exact details are still being kept under wraps, but we do know what sets the story in motion. Something connected to Gibbs’ past finds its way to him in Alaska, forcing him to deal with things he thought he’d left behind.
And considering what we know about Gibbs, it would have to be something pretty serious to make him abandon the quiet life he fought so hard to build. Showrunner David J. North has teased that it takes a major event to pull Gibbs out of his isolation, so this isn’t going to be a situation where an old friend simply calls him up and asks for a favor.
The connection goes back to Gibbs’ early days at Camp Pendleton, when he was still learning the job under Mike Franks. That’s where the show’s two timelines become particularly useful. The present-day story can show Harmon’s Gibbs dealing with the consequences of things he did decades ago, while Stowell’s younger Gibbs gradually reveals what actually happened back then.
The Season 3 premiere, titled “Don’t You Forget About Me,” finds Gibbs in Alaska when these so-called “ghosts from the past” suddenly disturb the life he’s built there. Whether those ghosts turn out to be actual people from his past or secrets that Gibbs has spent years trying to forget is still unclear, and the show isn’t exactly rushing to give that away.
Gibbs Won’t Stay in Alaska for Long
As peaceful as Gibbs’ life in Alaska might be, viewers shouldn’t expect him to spend the whole season sitting around in the wilderness. By the second episode, “My Own Worst Enemy,” he’s already heading back into civilization. This time, Gibbs turns to an old friend named Woody for help. Interestingly, Woody will also appear in the 1992 storyline, which means the show can explore the relationship from both sides. We’ll see the younger Gibbs getting to know Woody and, at the same time, the older Gibbs dealing with the history they share.
That gives Origins another way to play with the character’s past without simply turning the season into a collection of flashbacks. The audience gets to see how those early relationships shaped Gibbs, while also seeing what those same relationships mean to him decades later. And because Mark Harmon is involved throughout the season rather than appearing only in the premiere, this isn’t just a little surprise for longtime NCIS viewers. Gibbs is actually part of the story again, which is something the franchise hasn’t really done since he left the flagship series.
Mark Harmon Had to Like the Story
Harmon has also made it clear that this wasn’t something that had been planned years ago. The idea came together while NCIS: Origins was being developed, and he wasn’t interested in returning simply because the character was popular. For Harmon, the story itself had to be worth coming back for. He has said that it had to be an idea he liked before he would agree to step back in front of the camera, which makes sense considering how long he spent playing Gibbs and how much time he has already invested in the character behind the scenes.
Even while away from the main action, Harmon never completely left Gibbs behind. He continued producing, narrated Origins, and has supported Austin Stowell as the younger version of the character. Harmon has also spoken positively about Stowell taking on the role, which isn’t exactly an easy part to inherit given how closely Gibbs is associated with Harmon. Now the two versions of Gibbs are going to share the same story in a way the series hasn’t attempted before.
What Gibbs’ Return Really Means for NCIS: Origins
NCIS: Origins has always been about showing how Gibbs became the agent fans eventually came to know, but Season 3 is adding another layer to that idea. It’s not only looking at the young Gibbs anymore. It’s also asking what happened to the man after he finally walked away from NCIS.
Why did something in his past manage to find him all the way in Alaska? What unfinished business could possibly be important enough to make him leave the life he chose? And after all those years, how much of the old Gibbs is still hiding underneath the retired version of himself? Those are the questions Season 3 now has to answer. And for a character who spent so many years solving other people’s mysteries, it should be interesting to watch Gibbs deal with one that belongs entirely to him.