When NCIS needed someone to portray a young Leroy Jethro Gibbs, the show’s team didn’t need to look far to find the right person. Sean Harmon – the son of Gibbs actor Mark Harmon – stepped ...

If you're among those curious why Sean didn't return, this is why Mark Harmon's son doesn't play young Gibbs on "NCIS: Origins." Read more: Messed Up Ways Main Characters Were Killed Off While ...

It was additionally revealed that Mark Harmon will be deeply involved. His son (Sean Harmon) is also attached to the show. Provided NCIS and NCIS: Hawai’i get renewed, Actor Mark Harom appeared ...