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- Season 4 overviewSep 19, 2006-May 22, 200724 episodesSeason 4 episodes24. Angel of Death May 22, 2007
- Upon the director's return from a European junket, the team's secrets unravel.
- 23. Trojan Horse May 8, 2007
- Gibbs leads the investigation into a murder victim found in a taxi headed to NCIS headquarters.
- 22. In the Dark May 1, 2007
- The team asks a blind photographer to help track down a petty officer's killer.
- 21. Brothers in Arms Apr 24, 2007
- The director's risky solo meeting with an informant ends with a death.
- 20. Cover Story Apr 10, 2007
- A petty officer on whom McGee based a character for his latest book is murdered.
- 19. Grace Period Apr 3, 2007
- The team learns that a tip on terrorist activity was a trap that ended in the deaths of two agents.
- 18. Iceman Mar 20, 2007
- The team tracks a Marine's movements in the days up to his being left for dead.
- 17. Skeletons Feb 27, 2007
- An explosion at a military cemetery's mausoleum reveals a cache of dismembered human remains.
- 16. Dead Man Walking Feb 20, 2007
- The NCIS team suspects foul play when a Navy lieutenant is the victim of radiation poisoning.
- 15. Friends and Lovers Feb 13, 2007
- A young sailor's body is found in an abandoned building in a seedy part of town.
- 14. Blowback Feb 6, 2007
- Ducky goes under cover to stop the illegal sale of the Navy's top-secret weapons system.
- 13. Sharif Returns Jan 23, 2007
- The NCIS team must track down a wanted terrorist who has obtained a chemical weapon.
- 12. Suspicion Jan 16, 2007
- The team battles local biases while investigating the murder of a Marine officer.
- 11. Driven Dec 12, 2006
- A highly classified robotic vehicle causes the death of a Navy lieutenant.
- 10. Smoked Nov 28, 2006
- A burned and mummified body found in a furnace is that of a serial killer.
- 9. Twisted Sister Nov 21, 2006
- McGee takes things into his own hands when his sister arrives on his doorstep bloodied and confused.
- 8. Once a Hero Nov 14, 2006
- Suspicious activity surrounds a decorated Marine veteran's death.
- 7. Sandblast Nov 7, 2006
- A suspected terrorist attack kills a Marine colonel at a military country club.
- 6. Witch Hunt Oct 31, 2006
- A marine is attacked in his home and his daughter is kidnapped on Halloween.
- 5. Dead and Unburied Oct 17, 2006
- The team investigates the death of a missing lance corporal who was buried near a vacant house.
- 4. Faking It Oct 10, 2006
- The team is called to the scene of the murder of a petty officer.
- 3. Singled Out Oct 3, 2006
- The team searches the abandoned and bloody car of a missing lieutenant.
- 2. Escaped Sep 26, 2006
- NCIS temporarily reinstates Gibbs when an escaped convict threatens his friend's life.
- 1. Shalom Sep 19, 2006
- Ziva witnesses a political assassination and the FBI wants her.