Actor Mark Harmon is making a full-time acting return to the sprawling NCIS universe, stepping back on screen as Leroy Jethro Gibbs for the upcoming third season of the prequel series NCIS: Origins. Nearly five years after his initial exit from the flagship drama series, Harmon is expanding his involvement well beyond his duties as the show’s narrator and executive producer.
Season 3 of NCIS: Origins premieres on Tuesday, October 6, at 10 p.m. ET/PT on CBS, with episodes also streaming on Paramount+. Unlike his brief guest appearances and voiceover work in earlier seasons, Harmon will appear on screen in every single episode of the new ten-episode run, anchoring a serialized, season-long mystery that bridges his peaceful retirement in the Alaskan wilderness with his early career in the 1990s.
A Season-Long Mystery Connecting Past and Present
According to showrunner and executive producer David J. North, the upcoming season kicks off with the premiere episode titled “Don’t You Forget About Me.” In the episode, ghosts from Gibbs’ past finally catch up to him, shattering the quiet life he built in Alaska alongside his trusted rescue dog. Over the course of the season, viewers will discover that the present-day events unfolding in Alaska are directly tied to cases and experiences from Gibbs’ early days at Camp Pendleton in 1992.
This heavily serialized format represents a distinct shift for the broader NCIS franchise, which has traditionally relied on self-contained, procedural storylines across its massive library of more than 1,100 episodes. While Harmon handles the present-day narrative threads, actor Austin Stowell continues to portray the younger Leroy Jethro Gibbs in the show’s primary 1990s timeline.
What to Expect in the 1990s Timeline
Alongside Harmon’s expanded on-screen presence, the prequel’s core 1990s timeline picks up the pieces following the dramatic events of the Season 2 finale. The budding, complicated romance between young Gibbs and Cecilia “Lala” Dominguez, played by Mariel Molino, takes center stage as they navigate their complex feelings following their first kiss.
Showrunner Gina Lucita Monreal noted that pushing the characters toward a romance earlier than typical procedural pacing was a deliberate choice to surprise audiences and reward fan engagement. Meanwhile, young Gibbs continues working under the mentorship of Mike Franks, portrayed by Kyle Schmid, while the entire Camp Pendleton office faces the persistent threat of closure.
Returning Cast and Creative Team
The returning ensemble cast for NCIS: Origins Season 3 features several familiar faces rounding out the investigative team:
- Austin Stowell as the young Leroy Jethro Gibbs
- Mark Harmon as the present-day Leroy Jethro Gibbs and narrator
- Kyle Schmid as Mike Franks
- Mariel Molino as Lala Dominguez
- Tyla Abercrumbie as Mary Jo Hayes
- Diany Rodriguez as Vera Strickland
- Caleb Foote as Randy Randolf
Production is handled by CBS Studios, with David J. North serving as showrunner. North executive produces alongside Mark Harmon, Sean Harmon, Michele Greco, and NCIS: Los Angeles alumnus Eric Christian Olsen. Production details also confirm a heavy dose of 1990s nostalgia for the new episodes, including retro set pieces like a fully built Blockbuster Video location designed to ground the era authentically.
Broadcast and Streaming Details
NCIS: Origins Season 3 launches into a heavy Tuesday night lineup on CBS, airing at 10 p.m. ET/PT following NCIS at 8 p.m. and the debuting spin-off series NCIS: New York at 9 p.m.
For viewers looking to stream, new episodes are available live for Paramount+ Premium subscribers as they broadcast on CBS. Subscribers on any Paramount+ plan can also stream new episodes on-demand the day after they air.
