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 TimeADVERTISEMENT
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.
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