As Vance prepares to host diplomatic talks with Venezuela, the team is called in to investigate the dead body of one of his inside men.
NCIS is called in to investigate when a lieutenant returns home on Halloween Eve to find a surprise party being thrown for someone else at his home.
NCIS works with the CIA to discover what secrets are being kept by Capt. Butler, an aging former spy.
Things become tense when Knight is assigned to protect his wife after the home of a high-level defense contractor is attacked.
Torres receives intel from a confidential informant regarding top secret naval information that's at risk of being sold.
When a shocking tell-all threatens to ruin Christmas for a decorated Marine, NCIS must unwrap the truth and deliver a holiday miracle -- before the book hits shelves and turns a hero's legacy into a holiday disaster.
NCIS stages a fake wedding for two of its own in an attempt to take down the mob.
NCIS investigates the fatal poisoning of one of Kasie's forensic scientists; McGee is questioned by the Pentagon regarding the contents of his book.
NCIS investigates the case of a Navy lieutenant found dead at a blood donation bank; McGee needs help from the team to raise money for his twins' school fundraiser.
When Torres receives a text from Jimmy's daughter that she has discovered a large sum of money near the naval library, the team works together to investigate.
After a Navy Lieutenant's death reveals ties to Special Agent Sawyer, Torres and Knight uncover a murder linked to a wealthy family; Parker discovers a shocking connection between his mother's death and Lily.
After NCIS captures the hitman known as "The Poet," the team races to uncover who ordered the assassination of a Navy chief.
Ziva surprises Gibbs with a cryptic warning, prompting him to question why she remained underground for years while being presumed dead by family and friends.
With their lives in danger, Gibbs and Ziva's rogue investigation takes an unexpected turn when a possible terrorist plot is revealed.
After the body of a Marine lieutenant is found hidden under an 18-wheeler, the team tracks the vehicle's previous locations to pinpoint the crime scene and suspect; Sloane encourages the team to sit down and talk about Ziva's recent reappearance.
The team links a bizarre crime scene at Arlington National Cemetery to a string of attacks on homeless veterans; Vance orders McGee, Bishop and Torres to complete hours of evidence garage cleanup for withholding information.
After a petty officer's son is found murdered, evidence suggests Kasie's lifelong best friend is guilty.
While investigating a Marine's murder, the NCIS team uncovers a labyrinth of live-streaming spy cameras hidden in the rooms of a Virginia motel.
The NCIS team investigates the murder of a musician in the Navy's most elite band.
The NCIS team investigates a petty officer's murder that was livestreamed on a popular gaming app; Gibbs watches his 11-year-old neighbor when his mom must leave on a last-minute trip.
A malnourished and confused 9-year-old girl is found hiding in a storage unit; the team suspects the girl is the daughter of a Navy recruit who disappeared 10 years ago; Bishop discovers notes that Special Agent Ziva David kept on the case.
McGee reluctantly visits his high school after the unique computer password he used as a teenager is linked to the murder of a department of defense contractor; an intruder breaks into McGee's home in an attempt to steal his high school computer.
The NCIS team investigates a man overboard fatality from a Navy destroyer at sea; Torres is frustrated with Vance's assignment to mentor three high school students.
Jimmy is torn between family and work after his father-in-law asks him to tamper with evidence in a current murder investigation; Ed's poker buddy offers to help with the case.
Director Vance is notified by the Pentagon that the nuclear submarine Gibbs and Bishop are aboard to conduct a murder investigation has gone radio silent.
Torres relies on his team's investigative skills after he wakes up on a dilapidated fishing boat and is covered in blood and unable to remember the last 12 hours.
Following an active shooter lockdown at a naval hospital, the team searches for a suspect who fled the scene; someone from Sloane's past is a key witness in the case.
After human remains are discovered at a construction site, NCIS investigates the murder of a Marine major believed to have been killed in the 9/11 attack on the Pentagon; a personal history with the victim drives Gibbs to solve the crime.
After NCIS finds a secret government bank account that's funding a nationwide network of vigilante justice, the team must determine who is acting as judge and jury.
The team investigates the murder of a Marine sergeant who was hailed as a war hero for his efforts overseas; Gibbs turns to Dr. Grace Confalone for advice after he uncharacteristically unravels and abandons his team at a crime scene investigation.
A former FBI agent pleads with Gibbs to do whatever is necessary to take down drug dealers after his daughter is hospitalized from an opiate overdose; Gibbs is haunted by the personal aspects of the case and his history with vigilante justice.
When a beloved Marine is fatally stabbed just after returning from Afghanistan, the team makes a surprising discovery about his past.
Gibbs and his team face a challenge when the wife and 9-year-old daughter of a Navy captain are kidnapped from their home, and the captain is held hostage in his own office.
Gibbs and his team investigate when the decomposed body of a woman in a wedding dress is found in a subterranean cell decorated to resemble a 1950s bedroom.
When a Marine helicopter appears in the middle of a crop circle, Gibbs and the team investigate and encounter a town convinced that extraterrestrials played a role.
Gibbs and his team believe the accidental death of a Navy SEAL, during a routine exercise, was murder.
Gibbs finally comes face to face with Ari, the Bete Noir terrorist who had wounded him before escaping.