Many faces have come and gone throughout the 23 years NCIShas been on the air, but one that has stuck since the very first season is fan-favorite Timothy McGee (Sean Murray). We’ve watched him evolve from an awkward, lovable probie to the capable senior agent he is today, even as the cast members around him began dropping like flies. Funnily enough, McGee wasn’t supposed to stay further than one episode, let alone become the last man standing. During an exclusive interview with Collider, Murray recalls the early days of his NCIS career and how McGee went from a funny subplot to an essential mainstay. And as NCIS fans, we cannot be more thankful for it.
Sean Murray’s Agent McGee Was Only Supposed To Appear in One ‘NCIS’ Episode
McGee first appeared in Season 1, Episode 7, and almost immediately, we saw Tony’s (Michael Weatherly) eyes light up at a chance for mischief. Poor McGee had a huge red target on his back as his awkward, fumbling demeanor simply screamed “newbie” and Tony was more than happy to take advantage of it. And thus began the ultimate bromance, where Murray’s and Weatherly’s chemistry is too fun to resist. Murray recounts these early episodes during the interview:
“When NCIS was happening, the character of McGee was a one-shot guest star that was written by Frank Cardea and George Schenck. […] A couple of episodes later, they were three minutes short on an edit, so they had to come up with some material to make up a C story, and someone said, ‘Let’s bring back McGee, and we’ll put him with Tony. They were fun together.’ From that point on, McGee was just slowly a part of the thing.”
Even though McGee’s character was only written for one episode, he would be pulled back into the series occasionally for the rest of the season, slowly garnering the fans’ favor. But the turning point for the character was during Episode 19, “Dead Man Talking,” where McGee, Tony, and Kate (Sasha Alexander) are on a stakeout. Murray describes this episode as one that “informed a lot of the beats and tone of the show,” where the characters became “a little less one-dimensional,” and they could feel “something coming together.” During the episode, McGee and Tony’s relationship really shined, as the probie went from naively fetching coffees to advising the class-clown agent not to pull pranks. What was supposed to be a one-and-done character would gradually turn into someone truly special.
The Accidental Icon of NCIS
When people think of NCIS, they usually picture intense investigations, sharp dialogue, and a rotating cast of unforgettable characters. But hidden beneath the spotlight is a story that feels almost too good to be true—a character who was never meant to last, yet became one of the show’s most enduring pillars.
That character? Jimmy Palmer, played by Brian Dietzen.
Yes, the lovable, awkward, and surprisingly resilient medical examiner assistant wasn’t even supposed to stick around. And yet today, he stands tall with over 400 appearances—making him one of the longest-serving faces in the franchise.
So how did that happen?
A Character That Was Never Meant to Stay
The Original Plan for Jimmy Palmer
Back in the early seasons of NCIS, Jimmy Palmer was introduced as a minor, almost throwaway character. He worked under the legendary Dr. Mallard—better known as “Ducky,” played by David McCallum.
Jimmy wasn’t the star. He wasn’t even close.
He was quirky comic relief. A background presence. A character designed to fill space and maybe deliver a few awkward laughs.
That’s it.
Why He Was Supposed to Fade Away
Television is ruthless. Characters come and go all the time, especially minor ones. Jimmy was never part of the original long-term storytelling plan.
No dramatic arcs.
No emotional centerpieces.
No spotlight.
Just a guy in the autopsy room.
The Unexpected Rise of a Fan Favorite
Something Clicked With Audiences
But then something strange happened.
Fans started noticing Jimmy.
Maybe it was his nervous energy. Maybe it was his sincerity. Or maybe it was the way he brought warmth into one of the show’s darkest settings.
Whatever it was, viewers connected with him.
And once that happens in TV? Everything changes.
The Power of Relatability
Jimmy Palmer wasn’t a hardened agent or a fearless leader. He was… human.
He stumbled. He joked. He got nervous.
In a world of hyper-competent investigators, Jimmy felt real—and that authenticity made him stand out.
From Supporting Role to Core Character
Gradual Integration Into the Main Cast
Instead of disappearing, Jimmy began appearing more frequently. His screen time increased. His dialogue expanded.
Writers started to notice.
And slowly—but surely—he became part of the fabric of NCIS.
The Evolution Was Organic
There was no big announcement.
No sudden promotion.
Just consistent presence, episode after episode, season after season.
Like a background melody that eventually becomes the main theme.
Crossing the 400-Episode Milestone
A Rare Achievement in Television
Let’s put this into perspective.
Appearing in over 400 episodes of a long-running show is no small feat. It’s the kind of milestone reserved for TV legends.
And yet, Jimmy Palmer—a character that wasn’t even supposed to stay—reached it.
What Makes This So Impressive?
Consistency.
Longevity.
And the ability to evolve without losing what made the character special in the first place.
That’s incredibly rare.
The Emotional Depth Behind Jimmy Palmer
More Than Just Comic Relief
Over time, Jimmy became more than just the “funny guy.”
He experienced love. Loss. Growth.
His relationship with his wife, his struggles with grief, and his journey into leadership added layers that no one saw coming.
A Character That Grew With the Audience
Fans didn’t just watch Jimmy—they grew with him.
From awkward assistant to confident professional, his arc mirrored real life in a way few characters manage.
Taking Over the Legacy of Ducky
Filling Big Shoes
When Ducky began stepping back, the show faced a huge challenge.
Who could possibly fill that role?
The answer had been there all along.
Jimmy Palmer.
A Seamless Transition
What made the transition work wasn’t just writing—it was emotional continuity.
Jimmy wasn’t replacing Ducky.
He was honoring him.
Why Jimmy Palmer Became Essential to NCIS
The Heart of the Show
Every great series needs a heart.
Jimmy became that.
He grounded the show. He humanized it.
And in doing so, he became indispensable.
Stability in a Changing Cast
Over the years, NCIS has seen countless cast changes.
But Jimmy?
He stayed.
And that consistency gave fans something to hold onto.
The Secret Behind Brian Dietzen’s Success
Subtle, Powerful Acting
Brian Dietzen never overplayed the role.
His performance was understated, natural, and deeply authentic.
That’s harder than it looks.
Building a Character Over Time
Instead of dramatic shifts, he allowed Jimmy to evolve slowly.
Like real people do.
And that made all the difference.
The Importance of Supporting Characters in TV
Why Background Roles Matter
Jimmy’s story proves something important:
There are no “small” roles—only underdeveloped ones.
Give a character time, and they can become unforgettable.
The Power of Audience Connection
At the end of the day, viewers decide who stays.
And they chose Jimmy.
What This Means for the Future of NCIS
A New Era of Leadership
With Jimmy stepping into a more prominent role, the show continues to evolve.
But it does so without losing its roots.
Legacy Meets Innovation
That’s the magic of NCIS—it adapts while staying true to itself.
And Jimmy Palmer is proof of that.
Lessons From Jimmy Palmer’s Journey
Never Underestimate the Underdog
Sometimes the most impactful stories come from unexpected places.
Jimmy wasn’t supposed to matter.
But he did.
Growth Takes Time
Great characters aren’t built overnight.
They grow.
They evolve.
They surprise you.
Why Fans Will Never Forget Jimmy Palmer
A Character That Feels Real
Jimmy isn’t perfect—and that’s why people love him.
He reflects the messy, unpredictable nature of real life.
A Legacy That Was Never Planned
And maybe that’s what makes his story so powerful.
It wasn’t designed.
It just… happened.
Conclusion: The Role That Rewrote the Rules
Jimmy Palmer’s journey on NCIS is more than just a behind-the-scenes curiosity—it’s a masterclass in storytelling.
A character who wasn’t supposed to last ended up defining the show’s emotional core. A background figure became a central pillar. And an “extra” turned into a legend with over 400 episodes to his name.
In a world where everything is planned, predicted, and plotted, Jimmy Palmer reminds us that sometimes the best stories are the ones no one saw coming.