The Naval Criminal Investigative Service's team, led by Special Agent Leroy Jethro Gibbs, conducts criminal investigations involving the U.S. Navy and Marine Corps.

S4, E21

Brothers in Arms

Gibbs and the team must take action after the director's risky solo meeting with an informant ends with a death.

S4, E22

In the Dark

The team turns to a blind photographer (John Billingsley) to use his heightened senses of hearing and smell to re-create a crime scene and track down a petty officer's killer.

S4, E23

Trojan Horse

Gibbs leads the investigation into a murder victim found in a taxi headed to NCIS headquarters; Jenny discovers a secret about her past.

S4, E24

Angel of Death

Upon the director's return from a European junket, the team's secrets unravel; a merciless drug dealer holds Dinozzo and his girlfriend captive.