A whopping 489 episodes of NCIS have aired so far, making it one of the longest-running shows of all time. Any new fan with enough time on their hands will have plenty to enjoy, and so will those aiming for a second round of viewing. Over the years, members of the writers' room have had to be creative to avoid being repetitive, and it’s impressive just how easily they’ve managed to do it. Most of the plots stem from pure imagination. However, a few episodes are inspired by real cases, an approach that the producers actually intended to stick to when the show premiered.

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