Origins, follows a younger version of Leroy Jethro Gibbs. Recently, the series co-showrunner elaborated on the role Mark Harmon, Gibbs’ original actor, will play. NCIS’s upcoming sixth installment,

It’s not supposed to be about old Leroy Gibbs — this is about his younger self coming up in the Naval Criminal Investigative Service — but Mark Harmon will appear in the premiere episode of NCIS: Origins.

Origins explain Mark Harmon's involvement in the prequel series. The premiere of the CBS series is mere weeks away, focusing on a younger version of Leroy Jethro Gibbs (played by Austin Stowell) in the early 1990s.

I t was confirmed last month that Mark Harmon would indeed have a physical presence in the upcoming prequel NCIS: Origins. Now we're learning more about what that presence will en