The team tries to track down a serial killer, while Abby heads south of the border to give a speech with McGee in tow.
DiNozzo finds himself increasingly captivated by a woman he’s never met while investigating the murder of her brother.
When an NCIS polygraph specialist’s night job takes a dangerous turn, Gibbs, Fornell and the team have to uncover the truth.
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.
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.
Gibbs and the team investigate the shooting of a Marine and uncovers more to his life than anyone would have ever imagined.
Secrets arise when Gibbs former mother-in-law surfaces as a witness in a murder investigation.
When a Marine is found dead, Gibbs, Fornell and the team hit the open road to bust an illegal trucking operation.
The team finds themselves in a race against time when a terrorist group threatens to detonate a “dirty bomb” in the D.C. area.
While on the flight back from Paris, Tony and Ziva realize that their assignment to protect a government witness in an embezzlement case is in great danger when they learn that an assassin is located on the same flight.
Gibbs is worried about Tony’s ability to handle his job when Tony’s father turns out to be linked to their newest investigation, an assassination attempt on a foreign prince.
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.
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.
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 team literally finds themselves in the dark when the investigation into the death of a lieutenant is connected to a city-wide blackout.
With the team’s help, Vance faces his demons while uncovering a complex relationship with a killer that puts his whole family in danger.
A murder investigation prompts Gibbs and the team to play family counselor to his former mentor, Mike Franks, in the hopes of preventing a bloody international conflict.
When a Marine known for his practical jokes is found dead on Halloween Eve, the NCIS team discovers that the victim’s “good-natured” pranks may have inspired ghoulish retribution. Meanwhile, Ziva tries to adjust to her new role on the team.
When a Marine’s body surfaces halfway around the world, the investigation forces Ziva to dig up a buried chapter of her life.
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.
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.
As the hunt for Ziva’s replacement begins, Gibbs and his remaining team members must head back to work with the past still weighing heavily on their minds.
Ziva’s homecoming to Israel with Gibbs and the team is not a happy reunion with her father, the enigmatic and powerful head of Mossad. As tensions rise, Gibbs is forced to make a decision that sends shock waves through NCIS.
After a security breach at the SecNav’s residence leads to the death of an ICE agent, Gibbs and the team are forced to work with ICE and the FBI to find his killer. Meanwhile, Tony finally comes face-to-face with Michael Rivkin.
With the appearance of Mossad agent Michael Rivkin, Tony is forced to question Ziva’s loyalty to NCIS. Meanwhile, in Los Angeles, Special Agent Callen goes undercover to try to catch a terrorist cell while OSP psychologist Nate Getz discovers the startling truth about Gibbs and Special Agent Lara Macy’s relationship.
The body of a Marine leads Gibbs and McGee to the NCIS OSP division in Los Angeles, where a murder investigation quickly climbs to a matter of national security in which the two offices must work together to resolve. Meanwhile, Tony begins to snoop into Ziva’s personal life.
When a government scientist goes missing, Abby is recruited to carry on his work, but the team worries that she may meet the same fate as her predecessor.
Gibbs and the team must work with the shady Trent Kort to put away one of NCIS’s most wanted.
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.
The death of a boxer leads Vance to borrow the NCIS team and start investigating his death, while Gibbs digs into Vance’s past.
When a fellow agent is murdered, the NCIS teams heads into the desert to locate a woman who might hold the answer to the mystery murder.
A murder prompts the reopening of one of Tony’s old investigations, leading Gibbs and DiNozzo to reverse roles to solve the case.
Demons of the past come back to haunt Gibbs when he finds a cryptic message waiting for him at a crime scene.
The team discovers a link between a sergeant’s murder and his possibly treasonous private life.
Secrets from Ducky’s clandestine past come to the forefront after he’s attacked at a crime scene. The team uncovers disturbing secrets from the good doctor’s past.
The NCIS team must reveal the truth behind the murder of a jail guard which resulted in a prison riot and McGee being held captive by the inmates.
During the week of Christmas, The Team is Forced to work overtime when they discover their prime suspect had been dead for 17 years.
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 rely on information from questionable sources while trying to stop a criminal bent on stealing government secrets.
A strange delivery in a box arrived at the Navy facilities: The delivery driver and a Navy MP officer discover it is a sailor’s corpse.
A shocking revelation comes to light after the team is forced into playing a dangerous war game.