Season 4, Episode 24 Descent
First Aired: May 14, 2013
The fourth season ends with a nuclear explosion in the Pacific. The event reignites a search for stolen nuclear weapons, and leads Hetty to shuffle partnerships. She sends Callen and Kensi overseas and leaves Sam and Deeks as a stateside team.
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- Premiered: September 22, 2009
- Rating: TV-14
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- Premise: NCIS undercover agents work to crack the most difficult cases in Los Angeles. (more)