After almost 20 seasons, Leroy Jethro Gibbs left NCIS. Mark Harmon may have left the show, but this isn't the end for Gibbs.

Mark Harmon's son, Sean Harmon, seemed like an obvious choice to play young Leroy Jethro Gibbs in NCIS: Origins, but they ...

Mark Harmon holds Jethro Gibbs close ... Austin Stowell will portray a young Gibbs - a role once by Harmon's son, Sean Harmon, on seven episodes of "NCIS." For the prequel, Sean serves as an ...

The new Gibbs of 'NCIS' Austin Stowell will play the younger version of Mark Harmon's character ... in flashback by the actor's real-life son, Sean Harmon, who came up with the idea of the spinoff ...

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 ...

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 ...

The Mark Harmon from 'NCIS' is virtually unrecognizable as a dimwitted high school teacher in 'Summer School.' ...

Mark Harmon holds Jethro Gibbs close ... a young Gibbs — a role once played by Harmon’s son, Sean Harmon, on seven episodes of “NCIS.” For the prequel, Sean serves as an executive producer.