When the wife and blind 9-year-old daughter of a Navy captain are kidnapped, Gibbs and his team face a unique challenge.
The team is called in to investigate when the decomposed body of a woman in a wedding dress is found in a cell beneath abandoned military housing.
The NCIS team is called in to investigate when a perfectly functioning Marine helicopter is found in the middle of a crop circle.
When a woman dressed in a Navy uniform is found raped and murdered, Ducky spots a connection to an old case.
When the NCIS team finds the remains of an undercover FBI agent on a Marine firing range, they suspect they've stumbled onto a Mafia dumping ground.
The NCIS team is at odds with an FBI agent while trying to protect an Iraq War veteran and her family from a group of terrorists.
Gibbs and his team must clear the name of an elderly Marine who confesses that he murdered his best friend nearly 60 years ago.
Gibbs and his team investigate the mysterious death of a Navy commander who, after successful open heart surgery, seemingly bursts into flames.
Gibbs and his team are called to the scene when a Marine's wife kills an intruder who tried to rape her.
The team must work together to find Tony when he disappears during an undercover operation posing as an escaped convict.
When the body of a missing Navy officer is dredged up from a lake, the NCIS team must determine whether the death was an accident or foul play.
When a telemarketer overhears a murder while making a call, the NCIS team works with local homicide detectives find out who wanted the victim dead.
As he reassembles the pieces of three bodies found stuffed in barrels months ago, Ducky is shocked when he discovers their identities.
Gibbs gives McGee a shot at running a case when the NCIS team investigates a woman's claim that she witnessed the murder of a sailor.
The NCIS team investigates when a Marine records his own murder on video as he falls off a cliff.
The NCIS team investigates the bizarre death of a female petty officer who is found brutally murdered in the bed of a dance club bartender.
The NCIS team investigates when a sailor in Washington, D.C., receives a package from Paraguay containing a pair of blue eyeballs.
The NCIS team investigates when a petty officer who recently returned from duty is found dead backstage at a local bikini contest.
The NCIS team investigates when a petty officer commits suicide after being institutionalized for a nervous breakdown.
Gibbs and the team head back to school when a Marine in an ROTC program is found murdered on a college campus.
Gibbs and the team work to clear the name of a Navy medic killed in Iraq who was suspected of committing a murder in his hometown.
When a letter sealed with a kiss is delivered to NCIS, Tony assumes it's for him and opens it, releasing a mysterious powder into the squad room.
NCIS pays the ultimate price when a hunt for a terrorist assassination team turns deadly for one team member.
The final showdown between the NCIS team and an elusive arms dealer reaches an explosive and deadly conclusion.
While examining the body of a hit-and-run victim, Ducky makes a shocking discovery that leads to a search for a missing child.
Gibbs and Lt. Col. Mann unite for a joint investigation into the murder of a Marine captain who had access to highly classified information.
While demonstrating an autopsy on an anonymous cadaver, Ducky finds evidence of murder and a connection to a criminal mastermind.
When the team tries to talk a distraught naval officer down from a rooftop, what starts out as a suicide attempt turns into a murder investigation.
The team is put in mortal danger while investigating a mysterious death on a naval research ship that's been abandoned in the middle of the ocean.
When Gibbs agrees to help his deceased daughter's childhood friend, he finds himself at the center of an emotional journey into his past.
The team's investigation into the assassination of a Navy admiral takes an unexpected turn when they meet a woman searching for her missing husband.
During a forensics lab tour, the team learns that one of McGee's Youth Rangers was abducted and has been missing for years.
The NCIS team pays a heavy price when they try to track down a delusional Marine who escaped from a psychiatric ward.
When a Muslim Marine is found dead near a mosque, NCIS suspects murder, but the autopsy is delayed for religious reasons.
When high-tech naval radar goes missing, the NCIS team stakes out a warehouse to catch a suspected thief -- but witnesses a murder instead.
When a Navy dog handler is found mauled to death, the team needs to determine if his dog is the killer or the victim of a canine framing.
When the dead body of arms dealer La Grenouille surfaces, the NCIS team is put under investigation for his murder by the FBI.
When a mortar attack in Baghdad turns into a murder investigation, two members of the NCIS team are sent to Iraq to solve the case.
Ziva's undercover assignment takes a shocking and deadly turn when the serial killer she has been tracking becomes suspicious of her.
After coming face-to-face with an evasive killer and his gun, Palmer suffers a trauma-induced memory block and can't seem to identify the shooter.
A former NCIS agent is found dead. Suicide is the suspected cause of death -- until Jenny finds evidence of murder.
The team mourns the loss of one of their own, and their lives are on the line when Jenny's history with the deceased comes back with a vengeance.
As the season opens, the NCIS team is struggling to deal with Kate Todd's death, and Gibbs is determined to seek out and destroy her killer.
The man responsible for Kate's death is playing terror games with members of the NCIS team, strengthening Gibbs's resolve to find and kill him.
A serial killer Gibbs arrested years ago turns out to have an accomplice, which is all the more alarming when Agent Cassidy goes missing.
A dead Marine found inside a Civil War-era tomb at the Smithsonian appears to have been buried alive. Meanwhile, Ziva must prove her worth.
When the team investigates the murder of a petty officer gunned down on the freeway, they discover someone stole the officer's identity.
A Marine sergeant's wife who runs a live sex website suddenly vanishes, and preliminary evidence suggests that her murder was broadcast online.
While investigating the kidnapping of a lieutenant commander who had been working on a classified project, the team looks after his young son.
When two married assassins who were planning a hit at a Marine Corps ball die in an accident, Tony and Ziva pose as the couple to investigate further.
When body parts are found on a Marine base and all evidence suggests that Tony is the murderer, the NCIS team frantically works to clear his name.
When McGee shoots an undercover detective in an alley, Gibbs wonders about the detective's reason for being there in the first place.
Soon after a supermodel dies of an overdose on a Marine base where she was filming a reality TV show, the team is perplexed by two related cases.
During a search for illegal weapons in a naval shipyard, Tony and Ziva get ambushed and find themselves locked inside a container.
The team looks into the abduction of a Navy officer in charge of a nuclear weapons shipment, learning she also worked to combat online pedophilia.
When two Marine wives, both Korean-born, are found murdered, the NCIS team investigates and discovers ties to a sleeper cell and North Korea.
When a human head is found, Abby traces it to a deceased Navy captain, only to learn that the ashes in his family's possession aren't really his.
While the team is investigating the bizarre explosion of an ambulance carrying the body of a young Marine, Ducky makes a startling discovery.
A Navy petty officer appears to have been eaten by a bear but is found to have had a prior stab wound. And things only get more bizarre from there.
A high school student enters his classroom with a bomb strapped to his body and takes everyone hostage, demanding that his mother be brought to him.
A dead Marine is found in a frozen pond, but the mystery only deepens when the bodies of three prominent South American gang members surface.
The shooting death of a Pentagon cryptographer appears to be an at-home suicide until Abby learns that someone was with her at the time of death.
A couple checking into a motel room find bloodstains and human tissue. Meanwhile, the detectives dig into Abby's past to find out who's stalking her.
The NCIS team must race to locate Shepherd when a suspect in a drug bust dies in Ziva's custody and the man's brother takes Shepherd hostage.
Gibbs is hurt in a terrorist explosion and winds up in a coma, during which he has flashbacks of his family's murder and his Desert Storm injury.
When Gibbs wakes from a coma with memory loss, the team rushes to help him recall the details of an impending terrorist attack.
Investigating a Secret Service agent's death aboard Air Force One leads Gibbs and the team to uncover a terrorist's scheme.
When a Marine corporal formerly known for his lucky streak parachutes violently to his death, the agents investigate the men in his unit.
After a Navy commander's body washes ashore, NCIS must investigate a possible link to two murdered drug runners nearby.
A sailor's drowning death points to suicide, but Kate doesn't buy it. Meanwhile, Abby uncovers a link between his ship's crew and a video game.
The body of a Navy officer who vanished in 1994 -- along with $1.2 million -- is discovered in a cargo pod, but the money is nowhere to be found.
Two crewmen on a ship overdose on meth but insist they don't use, so Gibbs, Tony and Kate board the carrier to unravel the mystery.
When an ecoterrorist cell targets a submarine with an inside job, Gibbs and the team must determine which crew member is the cell's plant.
A sailor's death from ingesting emeralds leads the agents to Guantanamo Bay, where they must thwart a terrorist's plot to kill one of his own.
A Marine killed on a covert CIA mission apparently phones his wife, forcing NCIS to determine whether his death -- or the call -- was a hoax.
A woman who's been buried alive emerges from a shallow grave with no memory of who she is, but certain a bomb is going to detonate on a Navy ship.
After a CIA employee witnesses the murder of a Navy lieutenant who was testing a high-tech device, the agents try to determine why he was killed.
When a severed leg with a Semper Fi tattoo is found, the agents try to identify who the limb belongs to, leading to a case from two years earlier.
When a sniper kills two Marine recruiters, the agents must find the culprit before he strikes again.
With no apparent suspects or motive, the agents struggle to determine why a serial killer is targeting the officers at a naval base.
When his former commanding officer goes AWOL from Iraq, Gibbs must clear him of absconding with millions of dollars.
When a gun-toting terrorist takes Ducky, Gerald and Kate hostage, Gibbs and Tony must determine the man's ties and thwart his efforts.
A petty officer's death at a rave leads the agents into an investigation that points to possible kickbacks, a femme fatale and practical jokes.
When a former Navy SEAL convicted of murdering his wife escapes from Leavenworth, the agents must track him down before he seeks deadly vengeance.
When a fellow NCIS agent is murdered while investigating a cold case, the team vows to solve the mystery and catch his killer.
The case of a missing Marine leads Gibbs, Tony and Kate to discover that a serial killer is on the loose.
A Marine's gruesome death leads the agents to a Marine base boxing ring, an agency sting and a black market for assault weapons.
When a Navy SEAL dies while training for a critical mission, the agents have less than 48 hours to find his killer or the operation could be stalled.
The Hamas operative who held some of the team hostage months earlier resurfaces to kidnap Kate and shoot down the president's helicopter.
The NCIS team must learn to work without Gibbs when Ziva is wanted by the FBI after she inadvertently witnesses a political assassination.
When Fornell is threatened by an escaped convict, Agent Gibbs returns to the NCIS team to investigate the convict's case history.
When a Navy lieutenant's bloody car is discovered, the team goes undercover to shed light on the missing woman's search for a perfect man.
A routine traffic stop gets complicated when the Russian driver turns out to be connected to Homeland Security and one of Mike Franks's old cases.
A lance corporal bound for Iraq turns up dead in a vacant house. NCIS discovers the victim was first buried, then exhumed - and he had two fiancées.
Aside from being shocked by Abby's Halloween costume, the team investigates a ransom case involving a Marine's daughter and a nasty divorce.
Navy and Army investigators team up to hunt clues in a suspected terrorist attack, but a CIA lead sends them to a warehouse rigged to explode.
When a decorated Marine veteran's apparent suicide is clouded by suspicious circumstances, Gibbs makes it his mission to restore the man's honor.
When his sister shows up on his doorstep bloodied and disoriented, McGee breaks NCIS protocol and risks his job with an independent investigation.
The NCIS team must partner with the FBI when a suspected serial killer's body is found charred and mummified inside a Marine base furnace.
The team inspects a robotic, self-driving vehicle named Otto, in which a Navy lieutenant is found dead. Was it suicide or sabotage?
When the body of a high-level Marine intelligence officer turns up dead in a small town motel, NCIS must step on local toes to uncover the killer.
Wanted terrorist Mamoun Sharif is on the loose with a highly toxic chemical weapon, and NCIS must track him down before he strikes.
When the Navy's top secret weapon system is stolen, the team yanks Ducky out of the autopsy room, sending him undercover to thwart an arms deal.
A young sailor's body is found in a squalid section of town and while it appears to be suicide, the team uncovers evidence pointing to murder.
When a Navy lieutenant working for the International Atomic Energy Agency contracts radiation poisoning, NCIS suspects foul play by an insider.
An explosion at a military cemetery opens a crypt full of dismembered bodies; Gibbs and team must inform the victims’ families and solve the crime.
A frozen Marine regains consciousness on Ducky’s autopsy table, so the team retraces his steps, uncovering a secret Baghdad trip and a link to Gibbs.
An NCIS tip line call turns out to be a trap, killing two agents. Feeling personally responsible, Agent Paula Cassidy steps up to help investigate.
When a petty officer who served as a model for one of McGee's latest book characters is murdered, all eyes turn to the horrified author for clues.
Director Shepard's informant meeting goes awry when her contact is killed, leading Gibbs to intervene in Shepard's chase after their nemesis.
A blind photographer's unique, non-sighted senses help track a petty officer's killer; meanwhile, Gibbs and Tony deal with commitment issues.
Turning away from a pile of bureaucratic paperwork, acting director Gibbs leaps on the case of a man found dead in a taxi bound for NCIS headquarters.
Gibbs and his NCIS agents reluctantly reveal their most carefully guarded secrets during a round of Homeland Security polygraph tests.
After spending months tracking down his target, Tony is left with the blood of an NCIS agent on his hands, and it's up to Gibbs to help him.
The NCIS team uncovers a startling surprise after a young Marine shows up to his homecoming party with a fatal stab wound.
The line between McGee's personal and professional life is blurred when NCIS uncovers a connection between his grandmother and a lieutenant's murder.
The team searches for the person and motive behind a contract killer targeting a Navy lieutenant commander. Abby uncovers new info about her family.
When a Coast Guard officer is gunned down on a cargo vessel, the NCIS team searches for the killer but finds something else.
An NCIS case changes from accidental death to murder when evidence reveals that a Navy lieutenant died of forced over-hydration.
The NCIS team searches for answers when the current husband of both Gibbs's and Fornell's ex-wife is suspiciously kidnapped.
The NCIS team uncovers a discrepancy with DNA remains when investigating the crash of a military plane that had been transporting caskets.
As the NCIS team continues its search for a missing Marine, Gibbs and Ziva travel to her last known whereabouts in Afghanistan.
After Anthony DiNozzo Sr. is found with a dead body in his trunk and no memory of the previous night, NCIS must figure out if he is capable of murder.
When a Navy captain is killed in a hotel room, NCIS must track down and protect his pregnant companion from unknown assailants.
The investigation into the murder of a Navy commander leads the NCIS team to E.J. Barrett's whereabouts and a new probe into Agent Stratton.
When a Navy lieutenant is found dead in a building under construction, NCIS searches for a killer while dealing with her distraught detective husband.
During a routine stop for his morning coffee, Gibbs finds himself staring down the barrel of a gun, forcing him to question choices he has made.
When a Navy captain is found dead wearing an unusual costume, NCIS uncovers a secret society of real-life superheroes and must track down the villain.
When a Navy psychologist is found dead, Gibbs goes face-to-face with Dr. Samantha Ryan of Psy Ops to uncover the truth behind the suspected suicide.
Top-secret clearance from a research laboratory is jeopardized when the murder of a chief petty officer is connected to an international arms dealer.
The secretary of the Navy partners Gibbs with Dr. Samantha Ryan after top secret information is leaked by someone on the inside.
Director Vance's brother-in-law is the lead suspect when Gibbs and the NCIS team investigate the murder of a petty officer.
Following the murder of a Marine, Tony and Ziva join Ziva's mentor in Colombia in a search for a missing Marine lieutenant and Navy chaplain.
After a warehouse fire reveals missing Navy documents, posing a potential threat to national security, NCIS joins the Baltimore P.D. investigation.
The NCIS investigation of a fire on a Navy vessel leads to elevated security at all U.S. Navy facilities worldwide. DiNozzo and Ziva travel to Italy.
NCIS analyzes what secrets could be in the hands of a terrorist targeting the Navy when a high-tech bug is found inside a probationary agent's tooth.
Terrorism threatens to shake the foundations of the Navy and NCIS, as the team struggles to capture the newest member of the NCIS Most Wanted Wall.
A deadly car explosion appears to be connected to an NCIS agent who disappeared during an undercover assignment in Argentina.
A brawl at a high school reunion culminates in the accidental death of one of the fighters, and the discovery of bombs in his locker.
A Marine sergeant is in critical condition following a fall, and her psychiatrist tells Gibbs to investigate the case as an attempted murder.
Gibbs, Quinn and Palmer investigate the death of a Navy lieutenant on a destroyer during a tiger cruise, when civilian guests are allowed aboard.
Quinn and Bishop are sent to Philadelphia to investigate the connection between a missing MI6 officer and a murdered naval petty officer.
After a kidnapped naval petty officer escapes her captor, NCIS begins to suspect the involvement of her missing husband in her abduction.
The NCIS team tussles with a U.S. Immigration official over a key witness in a murder investigation who is about to be deported.
The NCIS team investigates a series of escalating threats against a congresswoman who has made enemies on both sides of the political fence.
Bishop is sent to Gitmo to investigate the death of a Muslim naval chaplain who had once been involved with the detention camp's inmates.
A hit-and-run investigation is complicated by Palmer's attempt to keep the victim's son from jumping off a building's ledge.
Evidence from the murder of a Navy captain who was under internal investigation appears to point to the address of Ducky's deceased mother.
NCIS scrambles for leads after an operation to apprehend a businessman suspected of using terror to manipulate the stock market is compromised.
The NCIS team jumps into action to track down Gibbs after he decides to independently resurrect an old undercover investigation.
The murder of a petty officer leads to a collaboration between NCIS and "The Sherlocks," a privately funded investigative team.
An official of the Defence Logistics Agency is commanded to kill herself. Reeves and Bishop follow new leads in the Chen case.
Abby is arrested after a terror simulation in which she's participating for a homeland security think tank is compromised.
McGee finds two intruders in his apartment. Congresswoman Flemming tries to persuade Director Vance to pursue a career in politics.
To carry out a sailor's dying wish, the NCIS team reopens an investigation into a case that was originally ruled an accidental death.
The NCIS team investigates after a marine drops dead at an event for a group that arranges free tours of war memorials for veterans.
The NCIS team is forced to hunt for the creator of a ransomware virus that has taken over the agency's computers and smartphones.
The murder of a Marine appears to be linked to a former dirt bike gang that Torres had once infiltrated in order to investigate.
The murder of a Marine sergeant in a national park appears to be only one of a series of related crimes in the same area.
The NCIS team travels out to sea after a young petty officer aboard a destroyer is found dead. McGee's fiancée, Delilah, is rushed to the hospital.
Gibbs, McGee and Torres travel to a dangerous part of Paraguay after the body parts of missing Navy SEALs turn up in the area.
As the team copes with the aftermath of the bombing, they are directed to find and terminate with extreme prejudice the terrorist responsible.
The body of an NCIS employee turns up four months after a bombing, and each member of the team is required to undergo psychological evaluation.
Ducky revisits a case he worked years previously and uncovers a link to the team’s current investigation into the death of a Marine.
When the crew of a helicopter that crashed at sea washes ashore days later, the NCIS team is charged with investigating the accident.
While looking into the murder of a Navy officer, the team uncovers a link to a Medal of Honor recipient who was also a close friend of Gibbs’s father.
While investigating the brutal death of an officer, Gibbs discovers the chief witness suffers from post-traumatic stress disorder.
Gibbs continues helping a Marine who suffers from post-traumatic stress disorder as the team works to thwart a domestic terrorist.
Gibbs appeals to a former contact for help locating a kidnapped girl, while Abby and Ziva work with the girl’s young friend who witnessed the crime.
Gibbs and FBI Agent T.C. Fornell hunt for a shooter who tried to take out Fornell -- but their mutual ex-wife, Diane Sterling, gets involved.
The Christmas spirit is tempered when the NCIS team begins a murder investigation that leads them to a mysterious hoard of cash.
As the team works to solve a murder involving a petty officer and a journalist, Ziva's father -- the director of Mossad -- pays her a surprise visit.
Ziva buries her father as the team hunts down the hit man -- and the person who hired him -- responsible for the shootings at Vance's home.
Abby encounters some troubling flashbacks to her childhood when the NCIS team takes a case involving a Marine and a deadly car crash.
Gibbs and his team apprehend a notorious cyberterrorist but soon discover that his reach extends much further than they realized.
Investigating the sudden death of a Marine, the NCIS team follows the clues to an underground fight club. Meanwhile, Vance learns some shocking news.
Kidnappers seize Ducky and Palmer while they are transporting the body of an officer who committed suicide back to NCIS headquarters.
Gibbs's barber suspects his own son may be involved in a murder, and the NCIS team suspects a Marine may have stolen a small fortune from the Navy.
The wife of a dead Marine dog handler suspects a more sinister truth, and she asks Gibbs and his team to investigate.
After a medical officer is murdered aboard a Navy vessel during a storm, the team uncovers a host of suspects -- including McGee's estranged father.
The team looks into the plight of a Navy reservist whose husband has disappeared, and Tony worries that Ziva is planning to avenge her father's death.
NCIS gets involved when a Massad officer causes trouble in Virginia, and Tony and Ziva head to Berlin to track the killer of Ziva's father.
Ignoring orders from their superiors to step down, the team intensifies its search for Bodnar -- and Ziva avenges her father's death.
The Department of Defense hammer comes down over NCIS's handling of the Bodnar case, with the blow falling squarely on Gibbs.
While the rest of the team investigates the death of a SEAL, Gibbs faces intensifying scrutiny from the Department of Defense over the Bodnar case.
An explosion that causes a casualty linked to the agency changes Parsons's outlook on Gibbs and the team. DiNozzo and McGee investigate as civilians.
Determined to locate Ziva, Tony chases leads in Israel; Gibbs and the team continue their tireless hunt for Parsa and his growing terrorist ring.
The team must rely on Twitter for a case involving a missing Navy lieutenant; McGee misplaces his badge but doesn't tell Gibbs and the authorities.
Gibbs and McGee travel to Afghanistan when a murder case leads them to an Afghan women’s shelter Mike Franks has secretly supported for years.
DiNozzo revisits his Baltimore Police Department days when he spots a felony suspect from an old case at the crime scene of a murdered petty officer.
The group partners with the Coast Guard Investigative Service to probe a suspicious explosion on an oil rig; a prankster targets team members.
After Gibbs leaves mid-case to help his father reconnect with a former war pilot, Tony and McGee argue over who should run lead on the investigation.
When an FBI agent-turned-lawyer confides in Gibbs, the team must re-examine a hit-and-run murder case; McGee grows suspicious of Tony’s odd behavior.
After learning the secretary of the Navy was bugged during a confidential briefing, the NSA analyst who predicted the security breach joins the team.
The team discovers a link between a murder victim and the boyfriend of Diane Sterling, Gibbs and Fornell's ex-wife; a new analyst adjusts to NCIS.
When a mystery illness strikes children from military families, the team investigates and helps medical researchers; Vance struggles with forgiveness.
When a stolen drone leads to an elusive terrorist, NCIS teams with the Department of Defense, including Gibbs's former girlfriend.
Hunting for a terrorist, the team finds one of his cohorts using evidence from the drone attack. Emotionally shaken, McGee deals with the aftermath.
The murder of a port authority officer reveals Parsa's possible whereabouts; Bishop discloses her past association with the elusive terrorist.
After finding faulty bulletproof vests in a cache of stolen USMC gear, the team tries to locate the source and any vests already shipped to soldiers.
When DiNozzo is investigated in the death of a man impersonating an officer, the one eyewitness is DiNozzo's dad, who is in town to disclose a secret.
When a bomb blows before a military charity concert, the team must determine if the target was a washed-up rocker or if a larger scheme was in play.
When the body of a New Orleans politician and ex-NCIS agent washes ashore, the two field offices unite to uncover the motive and reveal the killer.
Gibbs and Special Agent Pride chase leads in New Orleans after evidence points to a copycat serial killer; Bishop sends DiNozzo a special souvenir.
After returning to the Department of Defense, McGee's girlfriend finds a break in a controversial case; DiNozzo advises McGee about his love life.
The team must ascertain if an officer's murder was the result of a bar fight or because he knew too much; DiNozzo and McGee start a juice cleanse.
The team investigates the disappearance of a photographer who was scheduled to testify at an Army court-martial hearing.
DiNozzo is given an assignment to bring an admiral's daughter home from France, but he turns to the team when he enters a controversial crime scene.
NCIS investigates a fire on a ship that served as a secret detention site for terrorists; Gibbs returns to his childhood home after his father dies.
With Gibbs recovering on a naval ship, Tony and CIA officer Joanna Teague join forces in Shanghai to take down The Calling before war breaks out.
Gibbs returns to NCIS with a new look that intrigues the team. His first case back partners him with a DEA agent with whom he has some shared history.
A Quantico Marine is murdered after contacting Gibbs about a case. McGee and Bishop go undercover as a couple to keep tabs on a suspect and his wife.
Director Vance goes back into the field with Gibbs to investigate a murder that leads back to one of Vance's old cases involving an NCIS officer.
While visiting a pharmaceutical company's lab to consult on a murder case, Abby is trapped inside when armed men break in and take employees hostage.
While McGee and Delilah take the next step in their relationship, the team investigates a series of murders that may be the work of a copycat killer.
The team helps Ducky's cold case club investigate whether the son of a recently murdered ex-naval officer was wrongly convicted of murder years ago.
Tony and McGee search South Sudan for volunteer doctors who've gone missing, including the husband of Tony's ex-girlfriend. Gibbs has a setback.
When a petty officer accused of murdering his ex is freed in a mistrial, he begs NCIS to find the real killer. Bishop discovers something unsettling.
At Thanksgiving, Bishop goes home to Oklahoma while the team work on holiday plans and try to solve a case involving forgery, murder and leukemia.
Following an attack, Ducky relates the story of his decades-old search for his half-brother. Back at NCIS, Bishop makes a decision about her marriage.
Gibbs works with New Orleans's local NCIS unit to find Abby's missing brother. [Story concludes on "NCIS: New Orleans,” Season 2, Episode 12.]
During freezing weather, a seaman set to testify against a human trafficking ring is murdered, forcing NCIS to race the clock to find other victims.
When a man suddenly dies after attacking three co-workers inside a pressurized chamber, NCIS must solve the case -- but only from outside the chamber.
After the Secretary of the Navy's daughter is kidnapped for ransom, she brings in Gibbs and the team, who discover the case is more than it appears.
Gibbs lets Dr. Taft join him after a suspect in a munitions robbery dies on his operating table. Ducky's autopsy links the suspect to an old NCIS foe.
A case that's too open and shut nags at everyone on the team, leading each of them to ruin their evening by revisiting different aspects of the crime.
Gibbs bonds with a Marine who's the only survivor of an Iraq sniper attack. Forensic evidence leads Abby to the sniper's real mission closer to home.
The wife and mistress of a Navy public affairs officer each claims to have witnessed the other murdering the man. Tony's dad has a strange encounter.
Tony stumbles upon the case of his own stolen identity when he's handed an envelope of cash by a senator, who's being blackmailed by "Tony DiNozzo."
Gibbs and Fornell help former NCIS director Morrow find an ex-intelligence officer who escaped a British prison and was smuggled back into the U.S.
Gibbs and Fornell look for an assassin. After the teenage son of a deployed Marine shoots and wounds an intruder, Gibbs learns the boy was the target.
With Fornell in crisis, Gibbs, Monroe and MI-6 agent Reeves focus on Jacob's story. Abby finds a link to Kort. Gibbs' hunch may lead back to Ziva.
The NCIS, FBI and MI6 teams continue an international manhunt for an escaped British spy who's targeting current and former agents.
When Gibbs and McGee's mission overseas is compromised, the NCIS team races to locate them before a Russian mercenary group can do the same.
The NCIS team must determine if Washington's latest murder was connected to a mugging or to a private meeting with the president.
Ducky returns home to London after an NCIS case reveals a connection to his estranged childhood best friend.
After a gifted naval research scientist is murdered, the NCIS team is assigned to a joint terrorism task force by the secretary of the Navy.
When NCIS investigates a man overboard, they find Gibbs trapped on a ship that has been commandeered by pirates.
The NCIS team investigates the murder of the wife of a Navy commander who recently appeared on a jihadist target list.
Gibbs takes a case to heart when the NCIS team exposes a fraudulent charity that preys on the families and friends of missing military personnel.
Gibbs tries to help a corpsman who was arrested after providing unlicensed, yet necessary, medical care at the scene of a hit-and-run accident.
Surrounded by Thanksgiving travelers at the airport, Bishop and her husband work with DiNozzo on a case involving an elevated terrorist threat.
A week before Christmas, Washington faces a citywide Internet shutdown, which leaves the NCIS team to consult with three imprisoned cyberterrorists.
While Gibbs navigates between two ex-wives relentlessly vying for his attention, the team investigates copycat crime scenes.
The NCIS team searches for a home-grown terrorist after evidence reveals his role in the capture of a social worker in Syria.
When the first openly gay serviceman who was set to receive the Congressional Medal of Honor is murdered, NCIS investigates a possible hate crime.
The NCIS team investigates the murder of a U.S. Marine who attended the same military academy as Dinozzo.
The lead suspect in the team's current case is Gibbs's archnemesis, but he leaves the investigation to his team in order to help a grieving Fornell.
A police department homicide case is transferred to NCIS when the victim's stolen identity matches one created for Gibbs two decades earlier.
With his knowledge of and contacts in the world of black-market art, Dinozzo Sr. assists the NCIS team on a murder case.
McGee and the NCIS team partner with Delilah and the Department of Defense when a murder case includes a clue to a terror group in Dubai.
NCIS connects the murder of a petty officer to a 40-year-old cold case, the bombing of a U.S. airport.
DiNozzo partners with his girlfriend, Zoe, on a case after evidence calls for a joint investigation between NCIS and ATF.
After a U.S. Marine is killed, the NCIS team links the case to a terror group in Afghanistan, prompting Gibbs and Bishop to travel overseas.
The NCIS cyber operations division sends special agent Ned Dorneget to assist the team in the murder case of a Navy warfare engineer.
The NCIS cyber case continues after the team uncovers a group that's recruiting children to carry out acts of terrorism on a global scale.
Following a deadly bombing overseas, NCIS works with several agencies to track a global terrorist group that's recruiting teens via the Internet.
With drug cartel leader Paloma Reynosa on the loose and intent on fulfilling her vendetta, Gibbs takes desperate measures to protect his loved ones.
A young girl's kidnapping turns into much more when her grandfather complicates the investigation by working outside the law.
When the motives behind an attack on a female bomb tech link her to a murder, the team investigates her closely guarded personal life.
When the body of an American officer is connected to a British Navy vessel, murder turns into a volatile international incident.
When a controversial DJ and a Navy commander are shot to death on a live talk show, the team uncovers a sinister plan that involves a bomb.
Delving into the mind of a brilliant Navy scientist, Abby becomes fixated on solving her murder; DiNozzo's fling leads to an interesting Halloween.
DiNozzo's father returns, playing a vital role in a murder investigation that could have catastrophic results.
The team is assigned to protect Ziva's father when his attendance at a high-level conference leads to an unexpected turn of events.
The team scrambles for answers after a shocking ambush leaves Vance seriously injured and reveals a new twist to their current investigation.
The NCIS team investigates the disappearance of a Navy petty officer who is the sole witness in an upcoming murder trial.
Gibbs and the team partner with a Coast Guard Investigative Service agent to solve the murder of a Marine gunned down on a dinner boat.
A Navy recruiter's session at a college fair comes to a fatal end, prompting the team, along with Dr. Mallard's forerunner, to solve his murder.
The team springs into action to find the person responsible for beating a Marine sergeant to death in his own backyard.
The team members undergo mandatory psych evaluations while investigating the death of a commanding officer who was shot in his stateroom.
A botched assassination attempt forces the team to protect a foreign official's daughter who is studying in the U.S. and is smitten with McGee.
The dismembered fingertips and teeth of a murdered Marine are found in a pickpocket's stolen purse, launching a mission to find a coldblooded killer.
As a new agent joins the office, the team learns that a former employee found dead was selling details on how to rob a warehouse full of valuables.
Gibbs questions Vance's motives when he's asked to question a teenage boy accused of killing his retired Marine father.
The team connects a message written in blood, left by a murdered Navy commander, to a manuscript that may contain classified military information.
Special Agent Barrett returns to lead the investigation of a seaman's death that may be connected to a series of port-related murders.
The NCIS team tracks a Navy lieutenant's killer after a Pentagon security camera reveals a petty officer committing the crime.
When his ex-partner seems to be the victim of the Port-to-Port Killer, Tony revisits his days as a detective in Baltimore, where he first met Gibbs.
After new evidence reveals that the Port-to-Port Killer has infiltrated the agency, the teams chase every lead in a race to track him down.
The lives of the team are in jeopardy when they follow a trail of violence and come face-to-face with the infamous Port-to-Port Killer.
Gibbs learns of a startling relationship between a homicide case involving the killing of a petty officer and Vance's decision to break up his team.
While investigating an apparent suicide aboard an aircraft carrier, Tony discovers a possible connection to a larger scheme.
The team learns the hazards of Washington politics when an esteemed senator asks Gibbs to solve the murder of a female naval officer.
Things get a little personal when the ambush of two Marines leads the NCIS team to Gibbs's hometown, where some of his skeletons are revealed.
NCIS runs headlong into FBI interference when they look into the case of a Marine who was found tortured and murdered in his garage.
In the days before Halloween, a rampaging serial killer posts cryptic clues online, which the NCIS team must decipher before he strikes again.
Rookie Dwayne Wilson helps NCIS investigate a bank robbery that leaves a guard dead at Quantico, the world's most heavily secured Marine base.
When Vance instructs Gibbs to track down the traitor in the department, the team launches an elaborate war game designed to ferret out the mole.
To nab a crook determined to steal government secrets, the team is forced to rely on tips and information from sketchy sources.
A petty officer is killed in a car crash, but suspicious circumstances lead the agents to question whether his death was truly an accident.
A double homicide case leads the NCIS team to a set of fingerprints that implicate a Vietnam War veteran who's been dead for almost two decades.
When McGee enters a women's prison to investigate the murder of a guard, the inmates riot and take over, trapping him behind bars.
After Ducky is stabbed during an investigation, the team uncovers decades-old secrets from the doctor's past -- including allegations of war crimes.
When a captain is murdered in gruesome fashion, the NCIS team uncovers surprising details about his private life, including a possible act of treason.
The murder of a Marine with a questionable past -- and a cryptic clue left at the crime scene -- forces Gibbs to confront secrets of his own.
When one of Tony's old cases is reopened and a key witness found murdered, Gibbs hands him the reins to finally solve the case.
Gibbs gets a chance to show off his sniper skills when the murder of a fellow agent leads him to Arizona, the victim's home turf.
When Vance deploys the squad in his own private investigation into the death of a friend, Gibbs decides to take a closer look into Vance's past.
When an officer's son finds a gun at a playground, Gibbs and his team work to untangle a series of murders committed with the weapon.
Gibbs and the rest of the NCIS team join forces with shifty CIA agent Trent Kort to bring down one of the most-wanted criminals on their watch list.
A scientist working on a top-secret government project disappears, and Abby is tapped to take over in his absence -- but will she meet a similar fate?
NCIS teams up with the Office of Special Projects in Los Angeles to investigate a murder, but the case spirals into an issue of national security.
In Los Angeles, the joint task force closes in on a terrorist sleeper cell, but Mossad operative Rivkin interferes with an agenda of his own.
When a security leak at a top-secret meeting leads to the murder of an ICE agent, NCIS teams up with the FBI and ICE to hunt down the killer.
The team follows Mossad agent Rivkin back to Israel, where Ziva meets with her father -- the head of Mossad -- in an increasingly volatile situation.
The NCIS team investigates a drug mule's murder and finds an important clue that may lead to Gibbs and McGee.
A murdered Navy lieutenant is found stuffed inside the coffin of a civilian. Meanwhile, Gibbs and McGee undergo psych evaluations.
The reappearance of a police officer believed to have been killed years ago sparks renewed interest in an arms deal gone bad.
A stabbing at a murder-mystery party leads to a kidnapping investigation amid hurricane weather. Vance welcomes a new forensic psychologist.
When a man is found dead underneath a golf course's lawn mower, the NCIS team investigates the victim's ham radio in hopes of locating a witness.
After a friend of Reeves is kidnapped, the team homes in on a prime suspect. McGee is less than pleased when an embarrassing photo resurfaces.
When a convicted murderer who contends he was framed by the NCIS is granted an appeal after 10 years behind bars, Gibbs investigate his claims.
While trail running, a woman hears a mysterious voice that leads her to a dead Marine. She later agrees to help the NCIS solve the case.
The NCIS team searches for the person responsible for an MI5 agent's murder. Meanwhile, McGee and Delilah prepare to become parents.
While escorting a senator home from Afghanistan to be with his seriously injured son, Sloane and Torres find themselves in harm's way.
A seemingly successful JAG lawyer is found dead of an apparent suicide, but the NCIS team discovers that appearances can be deceiving.
Bishop and Torres go undercover in hopes of busting up a drug ring, but Vance is concerned that Torres may take things too far.
While investigating a deadly hit-and-run, the NCIS team discovers that their key witness has vanished, and must scramble for answers.
Gibbs and the NCIS team run into a familiar -- but not exactly friendly -- face while investigating a Navy commander's murder.
Following a deadly explosion, the NCIS team brings in Gabriel Hicks for questioning. Later, McGee seeks help from an unlikely source.
A petty officer's sudden and suspicious death inspires the NCIS to take a closer look at a care package he received.
While watching an antique collector show on TV, Gibbs and Ducky spot a piece of evidence that may help solve a cold case from 2002.
What starts as a relatively quiet day at the office takes a turn toward chaos when a maintenance man dies on the roof of NCIS headquarters.
After two men with connections to fake military IDs are murdered, Gibbs looks after a 10-year-old girl who may be the next target.
After a sheriff drives his car into a lake while transporting a suspect, the NCIS relies on a blind witness to help them home in on what happened.
A homeless veteran begs Gibbs to solve her mother's murder. Meanwhile, the team battles over who gets to dine with Abby at an exclusive restaurant.
Following a tragic loss, the NCIS team struggles to regroup and get justice for their fallen friend.
Gibbs receives a shock while attending the memorial service for a friend lost at sea. Meanwhile, the team attempts to accept a painful loss.
Sloane attacks a man who she believes tortured her in Afghanistan, but not everyone in the NCIS believes she's thinking straight.
As the hunt for Ziva's replacement begins, Gibbs and his remaining crew must get back to work with the past still weighing heavily on their minds.
The team finds that the bizarre death of a Marine and his friends may be linked to their past, but it is Gibbs who ends up traveling 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 winds 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.
When a Marine known for practical jokes dies on the eve of Halloween, the team finds that the victim's pranks may have roused ghoulish retribution.
A murder investigation prompts Gibbs and the team to play family counselor to his former mentor in hopes of averting a bloody 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.
The team members literally find themselves in the dark when an investigation into the death of a lieutenant is connected to a citywide blackout.
A dead Marine's work with 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.
When the enlisted son of a retired colonel-turned-preacher is found dead, the team believes he may be the victim of a hate crime; Gibbs's dad visits.
When a Navy pilot is found dead under odd circumstances, Gibbs and his team find themselves battling a no-nonsense attorney with a hidden agenda.
Gibbs questions DiNozzo's ability to do his job when Tony's father becomes involved in the team's investigation of an assassination plot.
When the government's star witness in an embezzlement case is targeted by an assassin, it is up to the team to help her make it home alive.
The team finds itself in a race against time when a terrorist group threatens to detonate a dirty bomb in the Washington area.
When a Marine veteran is found dead, Gibbs, Fornell and the team hit the open road to bust an illegal trucking operation.
Secrets are exposed when Gibbs's former mother-in-law surfaces as a witness in an investigation of her Navy captain fiancé's murder.
The team investigates the shooting of a Marine who had gone MIA and uncovers that he led another life that no one could have imagined.
The team members notice similarities between themselves and their Coast Guard 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 a D.C. madam to help them catch a killer.
The bodies of a petty officer and a mobster wash up on the beach, leading the team to a polygraph specialist who may covering up the truth.
DiNozzo finds himself increasingly captivated by a woman he has never met while he investigates the murder of her brother.
The team tries to track down a serial killer, while Abby heads south of the border into Mexico to deliver a speech, with McGee in tow.
When a colleague's murder sends shockwaves through the team, Gibbs uncovers a surprising link to the crime; the team learns of the rape of a sailor.
In Mexico, Gibbs faces his demons and meets the head of a drug cartel, bringing him to a startling decision; a prisoner dies on Tony and Ziva's watch.