The team discovers the bizarre death of a Marine and his two friends may be linked to their past, but its Gibbs who ends up taking a trip down memory lane.
The team must take a second look into the death of a lieutenant after the blogger who accused them of a cover-up ends up dead.
When a Marine's body surfaces halfway around the world, the investigation forces Ziva to dig up a buried chapter of her life.
A Marine famous for pulling his original pranks is found murdered on the night of Halloween and the NCIS team uncovers that the victim's pranks may have become a ghoulish retribution.
Meanwhile, Ziva is given a new role on the team.
Prompted by a murder investigation, Gibbs and his team need to play family counselor to Gibbs' former mentor, Mike Franks, hoping to prevent an international conflict.
With the team's help, Vance faces his demons while uncovering a complex relationship with a killer that puts his whole family in danger.
When an attempted robbery leaves a Lieutenant dead and the entire city without power, the team must figure out what happened through old fashion methods.
A dead Marine's day job at a government think tank leads Gibbs and the team into the life of a 12-year-old prodigy who may be the killer's next target.
The body of the son of a retired Colonel-turned-preacher is found and the team have their suspicions that he may be the victim of a hate crime.
Meanwhile, Gibbs gets a holiday visit from his father.
Songs: Blue October -- Kangaroo Cry
When a Navy pilot is found dead under strange circumstances in a secluded area, the team finds themselves battling a no-nonsense attorney with a hidden agenda.
Anthony DiNozzo Sr., father of Tony gets involved with a case concerning an assassination plot against a prince. The elder DiNozzo's link will cause Gibbs to doubt whether Tony can remain impartial in the investigation.
In order to solve a case, Tony and Ziva are sent packing to the most romantic city in the world, Paris! The hotel screws up their room reservations and accidently has them share a room.
When a Marine is found dead, Gibbs, Fornell and the team hit the open road to bust an illegal trucking operation.
The team investigates the shooting of a Marine and uncovers more to his life than anyone would have ever imagined.
The team discovers striking similarities between themselves and their CGIS (Coast Guard Investigative Services) counterparts when a Navy diver seeking sunken treasure is found dead.
The death of a Navy officer leads Gibbs and the team into the world of high-priced call girls, relying on D.C. Madam Holly Snow to help them catch a killer.
When an NCIS polygraph specialist's night job takes a dangerous turn, Gibbs, Fornell and the team have to uncover the truth.
DiNozzo finds himself increasingly captivated by a woman he's never met while investigating the murder of her brother.
The team tries to track down a serial killer, while Abby heads south of the border to give a speech with McGee in tow.
In the conclusion of a two-part finale, Gibbs heads to Mexico for a showdown with a drug cartel intent on revenge. Gibbs has to reassess the rules by which he lives when he is forced to make a devastating choice to save the lives of his team.