Mark Harmon has officially marked his 400th episode as Leroy Jethro Gibbs on NCIS. Since the pilot aired in 2003, Harmon has been the backbone of the series, not only as the lead actor but also as an executive producer.
A Journey Through Time
To celebrate this landmark episode, the show took a nostalgic trip back in time. Airing at the end of November, the 400th episode titled "Everything Starts Somewhere" delighted fans by depicting how Gibbs first met Donald "Ducky" Mallard, played by David McCallum.
Adding to the significance, Harmon's son, Sean Harmon, portrayed a young Gibbs, making the event a family affair.
"There's pride involved," Harmon admitted, reflecting on Sean's role in the series' history. The episode, set in 1980, revisits a pivotal case that brought Gibbs and Ducky together. The flashbacks show young Gibbs and Ducky navigating a crime scene involving a civilian accountant with LEOPARD syndrome, a car accident, and a connection to the notorious Zucado crime family.

The Genesis of Gibbs and Ducky's Bond
In this episode, fans witness how Gibbs and Ducky's bond was forged under unusual circumstances. Driving on the wrong side of the road, a young Ducky inadvertently saves Gibbs's life.
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