NCIS: Origins Season 2 Fall Finale Finally Reveals What Really Happened When Gibbs and Diane Got Married

The NCIS: Origins fall finale finally answers a question the mothership has teased for years: how on earth did Gibbs and Diane end up married? The show does not go for romance or destiny here. It gives us a messier, human chain of decisions that starts with a breakup and ends with an impulsive Vegas wedding. Yep, they went there.

How it all goes down

• Diane lands a job offer in Los Angeles and asks Gibbs to move with her so they can see where this is going.
• Gibbs says no — his home, his family, his whole life are where he is. Diane does not want a long-distance thing, so she ends it.
• Back at work, the team clocks that Gibbs is acting off. Meanwhile, Lala has her own crisis: her favorite informant, Twitchy Ton, has been shot.
• In flashbacks, we see Lala recovering after a hospital stay, with coworkers cycling through to check in. Randy drops the news that Gibbs and Diane split, and Lala brushes it off with: 'That’s great. I’m happy for him.'
• Then Franks shows up with a gut punch: Lala failed her fitness test and is getting stuck at a desk — exactly what she does not want.
• Back in the present, Lala confronts Gibbs for not visiting her post-hospital. He says he and Diane fell apart because Diane misunderstood what he meant by 'family.'
• Lala calls him on his patterns — he pushes people away when he gets scared — and tells him Diane is a good one and he blew it.
• That lands. Diane comes by Gibbs’s place, and he tells her he doesn’t want to end things. She agrees to try long-distance.
• And then comes the curveball: in voiceover, Gibbs admits he took Lala’s nudge a little... aggressively.

'Too far.'

Cut to Las Vegas. Gibbs gets drunk, and he and Diane get married. The episode drops us right at the altar with young Gibbs and Diane, tying a neat bow on how his future ex-wife became his first spouse.

The messy part is the point

What I liked here is how the show threads the needle between character work and plot twist. Gibbs refuses to uproot for LA, Diane refuses a long-distance maybe, Lala confronts Gibbs about his emotional habits, and one impulsive night later, the pieces line up in a way that is chaotic but also very them. It is a very show-specific detail that the 'fix' for a near-breakup is a Vegas chapel, but it tracks.

What’s next

The finale leaves the fallout for later — as in, after the break. NCIS: Origins returns on Tuesday, February 24, 2026, at 9/8c on CBS. We will see how a long-distance compromise turned into rings, and what that means for Gibbs, Diane, and everyone stuck working with newlywed Gibbs the morning after.