Mark Harmon to Appear in 'NCIS: Origins' Premiere as Narrator and Executive Producer

The new CBS prequel series will feature Austin Stowell as a young Leroy Jethro Gibbs, with Harmon making a special on-screen appearance.

Mark Harmon will briefly appear on camera in the premiere episode of 'NCIS: Origins', in addition to serving as the series' narrator and executive producer.
The show will focus on a young Leroy Jethro Gibbs, portrayed by Austin Stowell, as he begins his career in 1991 at the NIS Camp Pendleton office.
Harmon, who played Gibbs for nearly two decades on 'NCIS', exited the original series in Season 19 and has since been involved in various executive roles.
The series premiere is set for October 14, 2024, immediately following the debut episode of 'NCIS' Season 22.
The cast of 'NCIS: Origins' includes Kyle Schmid as Mike Franks, Mariel Molino as Lala Dominguez, and Tyler Abercrumbie as Mary Jo Hayes.