Episode:Descent

is the final episode in the fourth season of NCIS: Los Angeles, and the ninety-sixth in the series as a whole excluding the back door pilot episodes and any crossovers.
==Synopsis==
Callen and Kensi head overseas and Sam and his wife go undercover when an explosion reignites the search for stolen nuclear weapons.
==Cast==
===Series Regulars===
 
===Recurring Cast=== 
==Production Notes==
Category:Episodes
Category:Season Four Episodes
Category:Season Finales