NCIS has celebrated another milestone, and it's quite the feat: its 500th episode, in its 23rd season, and perhaps the most shocking installment of the series.
It was 100 episodes ago that the CBS drama delivered a love letter to Gibbs (Mark Harmon) and Ducky's (David McCallum) friendship, revealing how they'd met (with returns from Mark's son Sean Harmon and Adam Campbell to play their younger selves in the flashbacks). This time, the focus was on Vance (Rocky Carroll), as he sacrificed himself and died protecting the agency.
Below, we're taking a look at all the milestones the procedural has marked so far. They've brought a team member on officially, introduced an agent's relative after years of only hearing about him, featured memorable cases, and been among the best episodes of the series. Scroll down to see our ranking, from least to most memorable.
