NCIS: This is Mark Harmon's son in Episode 400 as a young Leroy Gibbs

NCIS: How did Gibbs and Ducky`s friendship originate – Have they always been this close?

Fans of the NCIS naval crime investigation series were excited for the second episode of season 18.

As all loyal fans of NCIS know, the 400th episode of NCIS will reveal the backstory of Leroy Gibbs, including his psychological research and the first time he meets his friend Ducky.

The moment young Leroy Gibbs and Donald 'Ducky' Mallard met on NCIS, aired in episode 400 
The moment young Leroy Gibbs met Donald 'Ducky' Mallard, aired in episode 400

Similarly, fans also know that actor Sean Harmon, son of protagonist Mark Harmon, will play the young Leroy Gibbs in the show's 400th episode. This is what the elder Harmon had to say about his son's arrival in season 18.

"The fanbase of this show should like this episode. I know when [showrunner] Steve Binder wrote it, it was something he had in mind to, in some ways, reward the audience a little bit -- people who have been tracking this show for as long as they had and highlighting those two characters," star and executive producer Mark Harmon exclusively told ET's Kevin Frazier. "So much of what I do here is based on getting a script and reading it and then trying to attack it as it is as a script. The fact that we had a lot of months to think about the 400th episode with how it ended last year for us here, four shows short, think everybody was pleased to come back and try to lock into what this show was and is, and what we are trying to do."

Recall that actor Sean Harmon returned to NCIS as a guest to play Leroy Gibbs again in his younger version. 

Young Leroy Gibbs and Donald 'Ducky' Mallard in the 400th episode of NCIS

During the 400th episode of the show, viewers got a glimpse of young Gibbs meeting medical examiner Donald "Ducky" Mallard (David McCallum), as seen in the photo posted on Twitter.

NCIS young Leroy gibbs and ducky

It's important to note that Sean Harmon, Mark Harmon's eldest son, played the young Leroy Gibbs six times in the series, between 2008 and 2012. While British actor Adam Campbell was in charge for bringing in young Ducky.

Harmon credited the writers for making Gibbs' journey interesting over the past 18 years.  

  1. Brian says:

    I had an issue with continuity. In an earlier season Gibbs is caught in an explosion causing him to relive the loss of Shannon and Kelly. It was revealed in that episode (Season 3, episode 23) that Ducky had no previous knowledge of Shannon. Ducky did not meet Gibbs until he was remarried.

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