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'NCIS' Celebrates 1,000 Episodes: See Never-Before-Seen Interviews With the Cast (Exclusive)

The show aired its first episode on Sept. 23, 2003.

In honor of the momentous occasion -- comprised of more than 4.2 trillion minutes of NCIS action -- ET is airing a special looking back at the show over the years and unveiling never-before-seen interviews and clips with stars like Mark Harmon, Vanessa Lachey, Michael Weatherly, Scott Bakula and more. 'NCIS' cast on set - Getty ImagesThe franchise follow the lives and cases of agents with the Naval Criminal Investigative Service and has kept fans around for years thanks to its heart-stopping storylines, incredible guest stars -- including pre-fame Zac Efron and Millie Bobby Brown -- and tender moments between characters. On top of a retrospective element, ET's NCISVerse: The First 1000 hosted by Kevin Frazier will look ahead at the two new shows coming to the franchise, NCIS: Origins and an unnamed series starring fan-favorites Cote de Pablo and Weatherly.

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