Mark Harmon will return to his beloved role in NCIS: Origins Season 3. Seasoned fans were delighted to learn that Harmon will finally be returning as Leroy Jethro Gibbs in the NCIS spin-off series. The wait is almost over as Season 3 of Origins is scheduled to premiere on CBS on October 6 at 10 p.m. ET/PT.As one of the longest-running franchises on the small screen, NCIS' success has led to many spin-offs. However, the Austin Stowell-starring prequel series has earned a special place in the franchise as it charts the early days of a younger Leroy Jethro Gibbs (played by Stowell) in the 1990s when he is stationed at Camp Pendleton. While Harmon has provided narration for NCIS: Origins since its debut, this is the first time that the actor will reprise his character in the prequel in a season-long arc.In the latest interview with Deadline, showrunner and executive producer David J. North reflected on Harmon's return in NCIS: Origins Season 3:"It had been almost six years, and we both really loved the idea that he had settled in Alaska, that he was happy, that he had this new rescue dog. But at the same time, Mark was excited to give the fans what they wanted."More on this in our story.Gibbs' 'ghosts from his past' will catch up to him in NCIS: Origins Season 3 View this post on Instagram Instagram PostThe last time we saw Mark Harmon's Gibbs was in NCIS Season 19 (2021). After wrapping up a case involving a hired hitman in Alaska, Gibbs decided not to return to the agency. After saying his goodbyes to Special Agent Timothy McGee (Sean Murray), Gibbs chose quiet retirement over returning to work and settled in Alaska with his dog, whom he rescued in Season 2.However, proving that a Special Agent never rests, Harmon's Gibbs is all set to return in NCIS: Origins Season 3. While North was tight-lipped about the details of Harmon's return, he teased that Gibbs will be pulled into a new conspiracy after the 'ghosts from his past' catch up to him. Harmon's Gibbs will be introduced in the Season 3 premiere, where he is living in Alaska with his rescue dog.According to North, trouble will soon find him in the present day:"When we first see Gibbs in the season premiere, he is still in Alaska with his trusted rescue dog but soon finds that the peace he found there isn’t going to be easy to hold on to. Ghosts from his past are catching up to him, and it may be enough to pull him out of retirement."Since Harmon will be featured in a season-long arc for Gibbs, fans can expect a high-stakes and action-packed season that will finally offer a brief glimpse into his life after retirement.Austin Stowell's younger Gibbs will continue the story in the 90s in NCIS: Origins Season 3 View this post on Instagram Instagram PostThe upcoming season will feature a dual-timeline plot that blends a 1990s Camp Pendleton case with a present-day mystery. While Harmon's Gibbs deals with ghosts of his past, Stowell's younger Gibbs and his crew will continue the story in the 90s.In addition to new and intriguing cases, the NCIS: Origins Season 3 premiere titled "Don't You Forget About Me" will increase the stakes when the team's golden boy, Special Agent Bernard "Randy" Randolf, is kidnapped. As the team races to rescue a kidnapped Randy, Gibbs and Lala will have to navigate their complicated feelings for each other after their kiss in Season 2.In addition to Harmon and Stowell, Season 3 marks the return of Tyla Abercrumbie as Field Operation Support Officer Mary Jo Hayes, Kyle Schmid as Special Agent Mike Franks, Mariel Molino as Special Agent Cecilia "Lala" Dominguez, Diany Rodriguez as Special Agent Vera Strickland, and Caleb Foote as Randy.Tune in to the NCIS: Origins Season 3 premiere on CBS on October 6.For the latest scoops on your favorite TV shows and movies, follow SoapCentral.