A different actor from the one in the main show will play young Leroy Jethro Gibbs in NCIS: Origins. Mark Harmon reveals why.

NCIS: Originsexecutive producer and narrator Mark Harmon explains why his son, Sean, isnt returning as Young Gibbs for the ...

Longtime NCIS star Mark Harmon's son Sean Harmon is not reprising his role as young Jethro Gibbs in the new prequel, and the ...

In the role of former NCIS lead Leroy Jethro Gibbs, Mark Harmon is a tough act to follow. But it seems he found a worthy ...

Despite 'heavy competition' for the role, Harmon knew Stowell was a star when he saw him. NCIS producer and star Mark Harmon ...

Mark Harmon tells Variety about his role as narrator and appearing in 'NCIS: Origins' after exiting the franchise.

Sean is well into other activities besides acting and enjoys a lot of different things. Mark Harmon explained to Variety: "He’s an actor, writer, producer, a surfer, he does a lot of things.

NCIS: ORIGINS premiered this week, and in honor of the show, stars Mark Harmon and Austin Stowell spoke to PEOPLE about their ...

Sean Harmon, on seven episodes of “NCIS.” For the prequel, Sean serves as an executive producer. “He’s an actor, writer, producer a surfer, he does a lot of things. You have to come to ...

After extensive speculation over who should play young Gibbs (exempting Sean Harmon, the actor's son, who previously played a younger version of Gibbs on NCIS but returned to Origins solely as an ...