Agenterne "G" Callen og Sam Hanna, specialagent Kensi Blye, LAPD-betjenten Marty Deeks, tech-geniet Eric Beale og analytikeren Nell Jones er frygtløse, selvom de står over for fjender fra både ind- og udland, herunder nordkoreanske spioner og russiske gangstere...

Episoder:
01: Active Measures
02: Citadel
03: Driving Miss Diaz
04: Command & Control
05: Blame It on Rio
06: Unspoken
07: An Unlocked Mind
08: The Long Goodbye
09: Defectors
10: Internal Affairs
11: Cancel Christmas
12: Core Values
13: Angels & Daemons
14: Come Back
15: Matryoshka, Part 1
16: Matryoshka, Part 2
17: Revenge Deferred
18: Exchange Rate
19: The Seventh Child
20: Seoul Man
21: Head of the Snake
22: Granger, O.
23: Where There's Smoke...
24: Talion