Key points
Mark Harmon will appear in every episode of NCIS: Origins season 3.
The actor will reprise the role of Leroy Jethro Gibbs in a “present-day mystery tied to his ’90s Camp Pendleton days.”
Harmon previously played Gibbs on 18 full seasons of NCIS.
Mark Harmon is heading back into the NCIS universe in a big way.
CBS announced Tuesday that the actor behind Leroy Jethro Gibbs will return in season 3 of the prequel series NCIS: Origins. Harmon will appear in every episode of the season in a “present-day mystery tied to his ’90s Camp Pendleton days in an action-packed story that unfolds all season long,” according to a press release.
Harmon has previously served as the narrator of NCIS: Origins, which stars Austin Pendleton as a younger version of Gibbs. Harmon also appeared in the series premiere of the prequel show in 2024, and last played Gibbs on screen in an NCIS–NCIS: Origins crossover event in November 2025.
Mark Harmon on ‘NCIS: Origins’
Credit: CBS
Harmon debuted as Gibbs in a pair of JAG episodes in April 2003 that served as the backdoor pilot for NCIS. He then headlined NCIS for 18 full seasons on CBS, and exited the show in the fourth episode of season 19 in 2021.
The actor, who is also an executive producer of NCIS: Origins, also played Gibbs in four episodes of the spinoff series NCIS: New Orleans between 2014 and 2018. He also played a comedic version of the character in a 2012 episode of Family Guy.
NCIS: Origins showrunners David J. North and Gina Lucita Monreal previously told Entertainment Weekly about bringing Harmon aboard for his season 2 guest appearance.
“In the end, Gina and I just went [to] him and said how important we think this episode is, how cool it is, how different it is that the network’s never done anything like it, doing a crossover using time. And Mark said, ‘Okay, let’s roll,'” North said.
“And the fact that he said yes and wanted to do that, it was just so meaningful and special,” Monreal added. “Having worked with him on the mothership, and then to have him come up here and say David’s words. It just meant the world.”
Stowell also told EW that he hung around to watch Harmon step back into the role for the crossover event.
Austin Stowell on ‘NCIS: Origins’
Credit: Sonja Flemming/CBS
“You better believe I wasn’t going to miss Mark stepping onto set as Gibbs for what might be the last time,” the Bridge of Spies star said. “He knew we had been working all day with more coming at us in the morning, so in typical Mark fashion he told me to ‘go home and get some sleep.’ I reminded him that a very wise man once told me, ‘Sleep is overrated.’ He laughed and said, ‘All right… now get the hell outta here.'”
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Executive-produced by North, Harmon, Sean Harmon, Michele Greco, and Eric Christian Olsen, season 3 of NCIS: Origins will air Tuesdays at 10 p.m. ET/PT on CBS this fall.
Read the original article on Entertainment Weekly
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