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,

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

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.