T hroughout the history of "NCIS," Special Agent Leroy Jethro Gibbs (Mark Harmon, Austin Stowell) has followed a strict set of rules, edicts that also inform the wisdom he imparts

WHAT IT'S ABOUT The last time we saw Leroy Jethro Gibbs (Mark Harmon) of the Naval Criminal Investigative Service was on the episode that aired Oct. 11, 2021, when he hugged it out with old friend and colleague Tim McGee (Sean Murray) after telling him that he wasn't going back home with him.

NCIS: Origins has finally premiered on the 2024 TV schedule, mean the time has finally come to explore Leroy Jethro Gibbs’ life in 1991, just a few months after his first wife a

This is a story I don’t tell. This is the story… of her.” With those few words from Mark Harmon’s narrator Gibbs, CBS’ NCIS: Origins (airing Mondays at 10/9c) raised millions of eyebrows and got people looking at the prequel spinoff n a new way.

Long running series 'NCIS' spawns another spin-off with 'NCIS: Origins,' which delves into Gibbs' early years.

Origins is great news for the franchise after his NCIS exit, but it also sets up a big problem for the prequel.

Mark Harmon remains an important component of the NCIS Universe, even though he is no longer starring on the flagship show. NCIS fans already knew Mark was part of the new prequel show, but nearly everyone thought it would only be behind the scenes.