Produced by Donald Bellisario (JAG), N.C.I.S. follows the workings of investigators at the Naval Criminal Investigative Service. Led by the wise Special Agent Leroy Jethro Gibbs (Mark Harmon), a crack investigator with no qualms about bending the rules to find his answers, the team takes on cases involving terrorism, murder, espionage, and international arms smuggling. Gibbs is aided by homicide detective Anthony Dinozzo (Michael Weatherly), ex-Mossad agent Officer Ziva David (Cote de Pablo), forensic scientist Abby Sciuto (Pauley Perrette), medical examiner Dr. Donald "Ducky" Mallard (David McCallum), computer expert Timothy McGee (Sean Murray), and new department head Jennifer Shepard (Lauren Holly). This collection presents every episode from the show's fourth series.

Episodes Comprise:

1. Shalom
2. Escaped
3. Singled Out
4. Faking It
5. Dead And Burned
6. Witch Hunt
7. Sandblast
8. Once A Hero
9. Twisted Sister
10. Smoked
11. Driven
12. Suspicion
13. Sharif Returns
14. Blowback
15. Friends & Lovers
16. Dead Man Walking
17. Skeletons
18. Iceman
19. Grace Period
20. Cover Story
21. Brother's In Arms
22. In The Dark
23. Trojan Horse
24. Angel Of Death