Gibbs discovers a shocking connection between the murder of a naval officer and the director's decision to disband his team.
DiNozzo's investigation into a Navy lieutenant's suicide takes a surprising and deadly turn when it seems that it has a connection to a larger scheme.
A distinguished senator asks Gibbs for help in solving the murder of a young female Naval officer.
When a murder investigation leads the team to Gibbs' hometown, secrets about his past are revealed.
Gibbs' hunt for the killer of a marine puts him on a collision course with an old friend.
A murderous psychopath taunts the team by leaving clues to the next victim's identity during the week of Halloween.
Gibbs second-guesses himself when Vance assigns a rookie to work with him on the team's investigation into a deadly bank robbery.
The team must play a dangerous war game that leads to very real consequences for one team member.
The team is forced to rely on information from questionable sources while trying to stop a criminal bent on stealing government secrets.
The team investigates the death of a petty officer and discovers he may have been leading a violent secret life.
The team is forced to put in overtime while searching for a suspect presumed dead when working on a case over Christmas.
McGee is held captive in a women's prison after a guard's murder leads to a takeover.
After Ducky is stabbed at a crime scene, the team uncovers disturbing secrets from the doctor's past.
The team discovers a link between a sergeant's murder and his possibly treasonous private life.
Demons of the past come back to haunt Gibbs when he finds a cryptic message waiting for him at a crime scene.
A murder prompts the reopening of one of Tony's old investigations, leading Gibbs and DiNozzo to reverse roles to solve the case.
When an agent is gunned down, Gibbs and Tony try to locate a woman in the desert who might have answers about his murder.
A boxer's death leads to Vance starting his own investigation; Gibbs looks into Vance's past.
A military family comes under suspicion when a boy finds a murder weapon and the team must track ownership of the gun.
Gibbs reluctantly works with Trent Kort (David Dayan Fisher) to put away one of the department's most-wanted criminals.
When Abby is asked to take over for a government scientist who has gone missing, the team fears that she will meet the same fate as her predecessor.
The murder of a Marine brings McGee and Gibbs to Los Angeles for a joint investigation with the NCIS office of special projects; Tony looks into Ziva's personal life.
Tony questions Ziva's loyalty to NCIS; Special Agent Callen (Chris O'Donnell) goes under cover; Nate Getz (Peter Cambor) discovers the truth about Special Agent Macy and Gibbs' relationship.
Gibbs and the team must work with ICE and FBI agents when a security breach results in the death of an ICE agent; Tony comes face to face with Michael Rivkin (Merik Tadros).