The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander.
Meanwhile, Abby uncovers new information about her family after undergoing tests for a kidney donation.
The line between McGee’s personal and professional life is blurred when NCIS uncovers a connection between his grandmother and the murder of a Navy Lieutenant.
The NCIS team uncovers a startling surprise after a young Marine shows up to his homecoming party with a fatal stab wound.
Gibbs and the NCIS team have to find answers regarding Tony’s months-long assignment when an NCIS agent is found dead.
The lives of NCIS members are in jeopardy when they come face-to-face with the infamous Port-to-Port killer, on the eighth season finale of NCIS.
After new evidence reveals that the Port-to-Port killer has infiltrated the agency, the NCIS teams chase every lead in a race to track him down.
After Tony’s ex-partner, Danny Price, appears to be the Port-to-Port Killer’s latest victim, he revisits his days as a detective in Baltimore, including his first encounter with Gibbs.
The NCIS team tracks a Navy lieutenant’s killer after a Pentagon security camera reveals a petty officer committing the crime. Meanwhile, Gibbs announces that Agent Barrett and her team will take over the Port-to-Port serial killer case.
To Gibbs’ displeasure, Special Agent E.J. Barrett returns to lead the investigation of a seaman’s death that may be connected to a series of port-related murders. Meanwhile, Ziva finally introduces her boyfriend, Ray, to the team.
NCIS connects a message in blood left by a murdered Navy commander to a manuscript that may contain classified military information.
Gibbs questions Vance’s motives when he is asked to interrogate a teenage boy accused of killing his retired Marine father.
NCIS discovers that one of its former investigative assistants found brutally stabbed to death was selling details for how to rob a warehouse full of valuable possessions belonging to a woman convicted of fraud. Meanwhile, a new special agent joins the office.
The dismembered fingertips and teeth of a murdered Marine are discovered in the stolen purse of a pickpocketer, launching NCIS on a mission to find a cold-blooded killer.
A botched assassination attempt in Belgravia forces NCIS to protect the Defense Minister’s daughter, who is studying in the U.S. and smitten with McGee. Meanwhile, Gibbs investigates the death of the U.S. Marine who was killed in the bombing.
The NCIS team undergoes mandatory psych evaluations while investigating the death of a naval commander.
The NCIS team springs into action to find the assailant responsible for beating a Marine to death in his own backyard.
A petty officer’s recruitment session at a college fair comes to a fatal end, prompting the NCIS team, accompanied by Dr. Mallard’s predecessor, to solve his murder.
Gibbs and the NCIS team partner with a Coast Guard Investigative Service (CGIS) Agent to solve the murder of a Marine gunned down on a dinner boat.
The NCIS team investigates the disappearance of a Navy petty officer who is the sole witness in an upcoming murder trial.
The team scrambles for answers after a shocking ambush reveals a new twist to their current investigation.
The team is assigned to protect Ziva’s father, when his attendance at a NCIS conference leads to some unexpected surprises.
The team is surprised when Gibbs asks Tony’s father to join them in a murder investigation.
Abby becomes fixated on solving a murder; DiNozzo’s latest fling leads to an interesting Halloween.
The team uncovers a sinister plan when a controversial DJ and a naval officer are shot to death.
The team hopes to avoid an international incident when an American officer is killed on a British ship.
The team investigates a bomb tech’s guarded personal life after she is attacked.
The NCIS team has to find a young girl that was kidnapped, but their investigation turns into something else when her grandfather gets way too involved.
Gibbs must take desperate measures to protect his loved ones with Paloma Reynosa still on the loose.
Gibbs heads to Mexico to face his demons and make a startling decision.
When a colleague’s murder sends shockwaves through the team, Gibbs uncovers a surprising link to the crime.
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.