NCIS stands for Naval Criminal Investigative Service. The series chronicles the operations of an elite team of special agents whose mission is to investigate any crime that has a shred of evidence connected to Navy and Marine Corps personnel, regardless of rank or position.
US crime drama series. The murder of a petty officer uncovers an internal plot to sell highly classified military information. (S6 Ep1)
The murder of a navy officer sparks a major security alert on board an aircraft carrier. (S6 Ep 2)
When a commander is murdered, an old friend of Gibbs, now a senator, believes he is being framed. (S6 Ep3)
The attempted murder of a young marine from Gibbs's hometown forces the special agent to dredge up his own past. (S6 Ep4)
The investigation into the murder of a Marine hits a major snag when it emerges that the main suspect is also the key witness in an ongoing FBI case. (S6 Ep5)
A serial killer who posts footage of his crimes online engages Gibbs and the team in a murderous game of cat and mouse. (S6 Ep6)
A robbery at Quantico base leaves a guard dead. As the agents investigate, they realise that cash may not have been the robbers' objective. (S6 Ep 7)
Gibbs sets his team the task of infiltrating a secure navy facility to steal a classified military file. (S6 Ep8)
Gibbs forms an uneasy alliance with Agent Lee in order to catch the man who has kidnapped her daughter. (S6 Ep9)
US crime drama series. The suspicious death of a petty officer leads the agents to an underground street-fighting organisation and a zealous neighbourhood-watch group. (S6 Ep 10)
US crime drama series. A former petty officer thought to have been dead for 17 years is implicated in a double homicide. (S6 Ep 11)
US crime drama series. McGee becomes a hostage inside a women's prison when a riot erupts following the murder of a guard. (S6 Ep 12)
Crime drama. Ducky is attacked at a crime scene by an Afghan woman who claims he killed her brother. The investigation unearths a dark secret from the ME's past. (S6 Ep 13)
Love and War: US crime drama. A navy captain is murdered and disemboweled in what appears to be a case of international espionage. (S6 Ep 14)
Naval crime drama. The murder of a marine leads the agents into the murky world of gang violence. Gibbs is forced to confront a mystery from his past. (S6 Ep 15)
US crime drama series. Tony takes charge of the team as he reopens a case he investigated three years earlier. (S6 Ep 16)
US crime drama. When a fellow agent is murdered, the team heads into the desert to find a woman who may hold the key to the mystery. (S6 Ep 17)
US drama. Leon Vance investigates the murder of an old friend, who he claims is a former marine - but Gibbs suspects he might be settling an old score. (S6 Ep 18)
Crime Series. When a young boy finds a murder weapon, the team must trace ownership of the gun to find who used it last and who was murdered. (S6 Ep 19)
US drama. Gibbs teams up with an old foe, CIA agent Trent Kort, to hunt down an international criminal at the top of NCIS's most wanted list. (S6 Ep 20)
US drama. The death of a marine unearths a top-secret military research programme. Meanwhile, Abby is called away to assist with an ongoing medical project. (S6 Ep 21)
Legend - Part 1: US drama. The murder of a Marine brings the team into contact with the Office of Special Projects in LA. Tony becomes concerned about Ziva's behaviour. (S6 Ep 22)
Legend - Part 2: Crime drama. Gibbs and McGee work with the NCIS Office of Special Projects (OSP) to track down a terrorist cell in LA. The agents question Ziva's loyalties. (S6 Ep 23)