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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.

When a colleague's murder sends shockwaves through the team, Gibbs uncovers a surprising link to the crime.

The NCIS has to find a serial killer, and their investigation leads them to a surprising revelation. Meanwhile, McGee tags along with Abby to the south of the border, where Abby has to make a speech.

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.

When the team links the death of a Navy officer to a call-girl, they have to use the help of Holly Snow to help them find the culprit.

The NCIS team is forced to work with the CGIS agency to solve a murder of a Navy diver that was found dead after trying to find sunken treasure.

The NCIS team stumbles upon a surprising discovery as they investigate the shooting of a Marine.

Secrets arise when Gibbs' former mother-in-law surfaces as a witness in a murder investigation.

After one of the drivers of a shady shipping company is found dead, the NCIS team has to go on the road to take down the illegal activities along with the FBI.

The NCIS team has to thwart an attempt by a group of terrorists to detonate a bomb before it's too late.

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.

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.

While investigating a bizarre murder of a Navy pilot, the NCIS team butts heads with an attorney that has a grudge against Gibbs.

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.

When a death of a Marine leads the NCIS team to a government think thank with employed child prodigies, the team has to protect a 12-year-old child who may be the next target of the killer.

The team needs to use other resources when an attempted robbery leads to the death of a Lieutenant and the entire city suffers a major blackout.

Vance's family is once again put into danger when an assassin from his past returns to threaten their safety, and the team works on helping Vance face his troubled past.

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.

When a Marine known for his love of practical jokes is found dead on Halloween, the NCIS team is called in to investigate, and they soon learn that his jokes may have been the reason why someone killed him.

The NCIS team is called in to investigate the murder of a Marine found halfway around the world, and the investigation takes a surprising turn when Ziva turns out to be connected to the deceased Marine.

When a blogger that accused NCIS of a cover-up turns up dead, the NCIS team has to find out who killed him and take another look at the closed case.

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.

With the past still left unresolved, the NCIS team must find a way to put it aside and concentrate on another investigation, but while looking for Ziva's replacement, the team comes to a stunning revelation.

Ziva's homecoming to Israel is not a happy reunion with her father who is the head of Mossad. While Gibbs and the team are there, Gibbs is forced to make a decision which is felt throughout 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.

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 team heads to LA to work with the team there to solve a murder investigation, which soon turns into something bigger. Meanwhile, Tony begins snooping into Ziva's private 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.

A boxer's death leads Vance to start up his own investigation, causing a sparring match with Gibbs.

While working on a case, an NCIS special agent is murdered in the same way as a businessman of Arizona, the native region of the agent. The only clue is a painting send to the Gibbs team, just before dying. The investigation will lead Tony and Gibbs in Arizona while the rest of the team will work on painting and the search for the assassins. The uranium will be at the center of the case and Gibbs will use his talents as a sniper to avoid death.

A Navy Lieutenant is found dead in a large suitcase in a luxury hotel. But the lieutenant had been the witness in a NCIS investigation when Tony was the leader of the team some years ago. Gibbs gives the direction of the investigation to Tony.

A Marine was found dead in his home town. He was found dead by young people playing with firearms. The dead Marine has a past in the Latin gangs.

The NCIS team investigates a bizarre murder of a sergeant whose suspicious private life might be the reason why he got killed.

Secrets from Ducky's Clandestine (secret) past come to the forefront after he's Attacked (stabbed) at a Crime Scene. The team uncovers disturbing secrets from the good doctor's past.

The Team is Forced to uncover the truth behind the murder of a guard after a Women's prison riot traps one of their on. Also Mcgee becomes held captive in the Women prison.

During the week of Christmas, The Team is Forced to work overtime when they discover their prime suspect had been dead for 17 years.

After a petty officer dies in a car crash, the team suspects foul play when their investigation leads them into the violent world of underground street fighting.

The team must rely on information from some questionable individuals to stop a criminal bent on stealing government secrets.

A shocking secret surfaces when the team is pushed into a war game, and one team member will face serious consequences.

Gibbs is put in a tough spot when he has to handle an assistant rookie assigned to his team by Vance to investigate a bank robbery case.

Gibbs and his team are search for a cyber serial killer who takes videos from his victims. The team quickly finds out that the video's of the dead victims are false. Director Vance shakes hand of a young female NCIS special agent, who has just received a citation.

The hunt for a marine's murderer puts Gibbs on a collision course with an old friend FBI Agent Fornell.

A Marine gets in a brawl inside a bar. When the bouncers kick him out, he finds two Marine buddies barely breathing between the trash cans. One doesn't survive and the team is called in to investigate. Gibbs goes back to his home town, where we meet his father.

When a young female Lieutenant Commander's body is discovered, shot in the back, suspicion falls ona prominent U.S. Senator who served in the Marines with Gibbs.

While stationed on an aircraft carrier, DiNozzo finds that a Navy Lieutenant's apparent suicide may be connected to a larger, deadly scheme.

"Last Man Standing" - The murder of a Naval Petty Officer leads Gibbs to uncover a shocking connection between the case and Director Vance's decision to disband his team!!!

The team continues to race against the clock as they hunt for the killer who took the life of one of their own.

A search for the killer of one of their own puts all the agents at risk.

Palmer becomes the main target of a mysterious killer who he recognizes as a person from his past.

While on assignment undercover, Ziva's task takes a shocking turn for the worst when the serial killer the team is tracking becomes suspicious of her.

After a mortar attack in Baghdad is ruled a murder, two NCIS members are sent into the heart of Iraq to handle the investigation.

When the body of an arms dealer surfaces, the team is put under FBI investigation for his murder and Jenny Shepard becomes their number one suspect.

When the team looks into a fatal dog mauling, Abby risks her career to prove the dog is innocent. Meanwhile, Gibbs begins to get closer to the secret Jenny is keeping.

When naval radar goes missing, NCIS stakes out a warehouse to catch the thief. However, plans change when the team witnesses a murder instead.

An investigation ensues when a Muslim Marine is found dead near a mosque. Out of respect for the families beliefs, Ducky refuses to perform an autopsy.

The team is assigned to find a Marine who thinks he's still in Iraq. Following a violent encounter, the NCIS team learns that the man is part of a top-secret experiment.

The team watches over a 9-year-old boy whose father is a wanted man. Their search for the boy's father leads them into the wilderness where they uncover the truth about the man's past.

The NCIS team looks into the assassination of a Navy Admiral. The case takes a shocking turn when they encounter a woman searching for her husband, a refugee from Africa.

Gibbs helps an old friend who is still coping with the death of his daughter who died 15 years earlier. As they investigate, Gibbs stumbles across a shocking conclusion to her death.