Harm, Mac and Bud assist Mic Brumby in Australia, representing a U.S. Naval officer who exchanged identities with a man he killed 28 years ago.

The NCIS must come to the rescue of one of its own when Sebastian is kidnapped while dining in a restaurant with his mother; Sebastian relies on his gaming skills in a prison break.

Four men were gunned down in their prime, shot and killed in three separate shootings; investigators would discover that the murders were all connected. and the evidence would lead them to a serial killer hungry for notoriety and fame.

Andy goes under cover as a prostitute during a citywide sting operation; Dov and Andy's attempt to impress Sgt. Boyko backfires.

The investigation into a fatal traffic accident leads to the discovery of a darker crime; Andy objects to how Luke handles a young murder witness.

Ray and his fellow officers seek revenge against the mob boss they think killed Detective Guardino, but Ray falls for the don's sister.

A real-estate tycoon wants to turn Fraser's apartment building into an upscale condominium; Ray bumps into his ex-wife.

A family's worst nightmare begins when 23-year-old Christina Morris goes missing while out with friends in Plano, Texas; police franticly search to find her alive, but it's the discovery of surveillance camera footage that reveals the shocking truth.

In 2017, Chinese exchange student Yingying Zhang mysteriously vanishes from the University of Illinois campus; police and the FBI turn to surveillance footage to uncover the shocking and sinister reality.

Conflict continues out of court in the desertion and murder trial taking place in Australia as Mac turns her attention to Mic.

When a renowned urban vigilante is killed after making a citizen's arrest, the team delves into the world of super heroes and comic books to find the killer; Adam gets closer to finding out who killed his sister.

Still reeling from the murder of one of their own, Steve and Catherine, along with Danny, Junior and some old friends, hunt down the killer; a bag of human bones discovered inside an abandoned storage locker goes missing.

When a widow gets a telephone call from her husband, the team must exhume the body believed to be that of the Marine.

After digging herself out of a grave, an amnesiac can remember one thing: a bomb is hidden on a Navy ship.

The team travels to Syria to capture a high-value target, but the mission quickly goes awry.

A short-staffed NCIS team tackles an abduction case while Hetty is held in Washington, D.C., and another team member remains in the ICU.

Harm and Mac defend an American captain who becomes a political scapegoat for a collision between a U.S. frigate and Greek and Turkish warships.

The NCIS and the FBI investigate a private plane crash in the bayou that killed three sailors; Sonja and Lasalle interview candidates for a job opening on the team.

When a renowned urban vigilante is killed after making a citizen's arrest, the team delves into the world of super heroes and comic books to find the killer; Adam gets closer to finding out who killed his sister.

Still reeling from the murder of one of their own, Steve and Catherine, along with Danny, Junior and some old friends, hunt down the killer; a bag of human bones discovered inside an abandoned storage locker goes missing.

Gibbs and his team board an aircraft carrier to find out how a sailor with no history of drug abuse overdosed on methamphetamines.

A decomposed body found in a tub of acid at a naval base leads Gibbs to deduce that an impostor is serving aboard one of the nuclear submarines.

The team travels to Syria to capture a high-value target, but the mission quickly goes awry.

A short-staffed NCIS team tackles an abduction case while Hetty is held in Washington, D.C., and another team member remains in the ICU.

Conflict continues out of court in the desertion and murder trial taking place in Australia as Mac turns her attention to Mic.

The NCIS and the FBI investigate a private plane crash in the bayou that killed three sailors; Sonja and Lasalle interview candidates for a job opening on the team.

In the fall of 2016, a football player went out with his teammates to celebrate an important win when tragedy struck; witnesses explain what they saw that fateful night and how Hicks was blindsided.

A heat wave makes life on the streets even more perilous for the rookies; the squad discovers that a serial rapist may be on the loose; during a blackout, Andy must take down a vicious predator alone.

Chris and Andy face a tough decision while investigating a vicious beating; Sam and Luke get competitive during a retraining exercise.

Fraser and Ray join forces with a Mexican secret-service (Maria Therese Gangel) agent to protect the leaders of a NAFTA summit from a political assassin.

In an attempt to avert an accident, Fraser causes a farmer to lose thousands of eggs; Ray and Francesca battle over lottery winnings.

In 2017, Chinese exchange student Yingying Zhang mysteriously vanishes from the University of Illinois campus; police and the FBI turn to surveillance footage to uncover the shocking and sinister reality.

Young professional Sasha Samsudean disappears after a night out in downtown Orlando, Fla.; detectives turn to video surveillance footage to unravel the mystery and bring Sasha's killer to justice.

Gunny is arrested for gay bashing following an off-duty altercation; Tiner's sexuality comes into question.

After fighting off an assassin in his own home, McGarrett and Joe White flee to Montana to prepare for a battle against those exacting revenge for a past SEAL mission.

McGarrett and the team support Danny and Rachel by determining what happened when Grace gets into a life-threatening car accident; Tani helps Koa when his rehab patient goes missing.

After a Navy commander is murdered on a beach, the team watches for a nude female sunbather who may be the only witness.

Ducky and Abby help identify a Marine whose severed leg is found in a trash receptacle, then the case takes a turn when the man's identity does not match his official photo ID.

A Triad assassin poisons a Homeland Security agent; the discovery of a warehouse of counterfeit purses reveals a money trail to stolen government funds; Nell joins the team in the field.

The murder of a Navy machinist sends the team on a citywide hunt for evidence; Anna Kolcheck (Bar Paly) partners with Callen and Sam in the on-going mole investigation.

Harm sticks his neck out for a Marine sergeant charged with the murder of his wife, a man who claims a miracle led him to the crime scene.

A Navy SEAL candidate is murdered weeks before his graduation; Wade seeks Pride's help when her adopted son announces his plan to join the Navy.

After fighting off an assassin in his own home, McGarrett and Joe White flee to Montana to prepare for a battle against those exacting revenge for a past SEAL mission.

McGarrett and the team support Danny and Rachel by determining what happened when Grace gets into a life-threatening car accident; Tani helps Koa when his rehab patient goes missing.

A decomposed body found in a tub of acid at a naval base leads Gibbs to deduce that an impostor is serving aboard one of the nuclear submarines.

The team travels to Guantanamo Bay in Cuba to probe a Navy translator's death caused by swallowing emeralds smuggled from Afghanistan.

A Triad assassin poisons a Homeland Security agent; the discovery of a warehouse of counterfeit purses reveals a money trail to stolen government funds; Nell joins the team in the field.

The murder of a Navy machinist sends the team on a citywide hunt for evidence; Anna Kolcheck (Bar Paly) partners with Callen and Sam in the on-going mole investigation.

Gunny is arrested for gay bashing following an off-duty altercation; Tiner's sexuality comes into question.

A Navy SEAL candidate is murdered weeks before his graduation; Wade seeks Pride's help when her adopted son announces his plan to join the Navy.

When Canadian boxing star Eddie "Hurricane" Melo is killed, investigators start digging into his connections to the Montreal Mafia; Mark Carcasole reports on the theories, the arrests and how Melo's daughter is keeping her father's memory alive.

Division 15 starts a city-wide search for an abducted 9-year-old girl; disturbing evidence is uncovered during an interrogation.

An inmate escapes during a prisoner transport; Gail and Dov try to help a man with amnesia; Traci and Chris help reconstruct notes missing from a court case.

Ian, a pathological liar, comes to Ray and Fraser for help in finding his girlfriend, who has allegedly been abducted by aliens.

Fraser dons a dress to investigate the disappearance of a student at an all-girl Catholic school; Ray reunites with an old flame who has become a nun.

Young professional Sasha Samsudean disappears after a night out in downtown Orlando, Fla.; detectives turn to video surveillance footage to unravel the mystery and bring Sasha's killer to justice.

Michele Davis dies after a traffic accident on the interstate near Des Moines, Iowa; surveillance cameras show that what first appeared as an accident could be something more sinister.

Korean terrorists, demanding restitution for war crimes against civilians, hijack Harm and Mac's plane.

Adam, Junior and Tani travel to the bottom of the Pacific Ocean when a murder takes place in a remote underwater lab -- and the killer may still be on board.

While investigating Flippa's friend's murder, McGarrett and Grover uncover a deadly plan by an extremist group on the Island; Grover has an emotional reaction to the case.

A sniper kills Marine recruiters and leaves a white feather behind as his calling card.

With the help of a local sheriff, Gibbs and his team hunt down a possible serial killer targeting naval officers.

A maintenance worker with a dark history puts a local teenager in danger; Sam has to choose which of his colleagues he'll take to the football game.

Callen poses as a patient in a mental health facility to find an NSA agent who vanished while tracking an ISIS cell that was attempting to cross the Mexican border.

When a seaman's suicide aboard an aircraft carrier becomes a murder investigation, Harm and Bud are assigned to aid in the search for the killer.

A sailor is murdered during a rowdy motorcycle rally in the city; Lasalle seeks personal advice from Gregorio.

Adam, Junior and Tani travel to the bottom of the Pacific Ocean when a murder takes place in a remote underwater lab -- and the killer may still be on board.

While investigating Flippa's friend's murder, McGarrett and Grover uncover a deadly plan by an extremist group on the Island; Grover has an emotional reaction to the case.

The team travels to Guantanamo Bay in Cuba to probe a Navy translator's death caused by swallowing emeralds smuggled from Afghanistan.

When a widow gets a telephone call from her husband, the team must exhume the body believed to be that of the Marine.

A maintenance worker with a dark history puts a local teenager in danger; Sam has to choose which of his colleagues he'll take to the football game.

Callen poses as a patient in a mental health facility to find an NSA agent who vanished while tracking an ISIS cell that was attempting to cross the Mexican border.

Korean terrorists, demanding restitution for war crimes against civilians, hijack Harm and Mac's plane.

A sailor is murdered during a rowdy motorcycle rally in the city; Lasalle seeks personal advice from Gregorio.

An unknown driver shot and killed Constable André Lalonde, known for his friendly nature and big mustache, and 25 years later, Mike Armstrong explores the impact of his murder on Lalonde's wife and two children and the continuing hunt for the killer.

Andy faces the possibility that her father may have murdered someone during a drunken blackout; Chris and Dov's squad car is robbed.

Andy questions her future with the force after the suspicious death of a young girl; the rookies find out if they have passed their evaluations.

After bailing out a teenage shooting suspect, Fraser (Paul Gross) battles Ray (David Marciano) to prove the young man's innocence. With Beau Starr and Isiah Thomas.

Terrorists take over a train carrying Fraser, Meg and a group of singing mounties; with Leslie Nielsen.

Michele Davis dies after a traffic accident on the interstate near Des Moines, Iowa; surveillance cameras show that what first appeared as an accident could be something more sinister.

When she interrupts a burglary at home, Diane Pranske is abducted and left for dead across state lines; detectives turn to surveillance video to find her assailant, and investigators try to get justice for this brutal crime.

A woman claims she fled the Navy because her recruiter lied to her; side effects of Viagra threaten a man's career.

As a dangerous hurricane hits Oahu, Five-0 is tasked with protecting El Diablo, a captured serial killer who is being hunted by an assassin; Tani's civilian safety check during the storm turns deadly; Rachel and Charlie evacuate to Danny's house.

When the top salesperson for a beauty company pyramid scheme is murdered, the team sifts through a long list of possible suspects who would want her dead; Adam befriends a homeless man.

Gibbs puts it all on the line to help a former commanding officer who is running for his life from the government.

A gun-toting man emerges from a body bag in the autopsy lab to take Ducky, Gerald and Kate hostage. Rudolf Martin guest stars.

An attack on a graduate student working on a new electromagnetic weapon for the Navy is linked to international warfare; Kensi struggles with physical therapy for her spinal injury.

Callen must interrogate his father after he is found in a patient's hospital room during a radiation poisoning case; members of the team discusses their plans for Thanksgiving.

When a Russian submarine explodes killing 110 men, the U.S. submarine seen tailing the submarine is blamed for the incident.

After a member of the United States Navy Band is murdered in her home, Pride looks after the victim's nephew, who is the only witness to the crime.

As a dangerous hurricane hits Oahu, Five-0 is tasked with protecting El Diablo, a captured serial killer who is being hunted by an assassin; Tani's civilian safety check during the storm turns deadly; Rachel and Charlie evacuate to Danny's house.

When the top salesperson for a beauty company pyramid scheme is murdered, the team sifts through a long list of possible suspects who would want her dead; Adam befriends a homeless man.

When a widow gets a telephone call from her husband, the team must exhume the body believed to be that of the Marine.

After digging herself out of a grave, an amnesiac can remember one thing: a bomb is hidden on a Navy ship.

An attack on a graduate student working on a new electromagnetic weapon for the Navy is linked to international warfare; Kensi struggles with physical therapy for her spinal injury.

Callen must interrogate his father after he is found in a patient's hospital room during a radiation poisoning case; members of the team discusses their plans for Thanksgiving.

A woman claims she fled the Navy because her recruiter lied to her; side effects of Viagra threaten a man's career.

After a member of the United States Navy Band is murdered in her home, Pride looks after the victim's nephew, who is the only witness to the crime.

A young woman disappears in Calgary, Canada, and a 911 call results in the discovery of an older couple dead in their home, leading police to uncover the tragic connection between the two cases as they discover evidence of a senseless killing spree.

An untimely arrest compromises a major drug bust; Andy goes under cover with Swarek; Dov must choose between his girlfriend and his career.

Andy butts heads with Division 15's new detective when they both investigate a shooting at a concert.

An exotic dancer tips off Fraser and Ray about mobsters taking over Chicago strip joints; with Milton Berle.

The people close to Ray are placed at risk when a man whom he helped place behind bars is released on parole; Internal Affairs investigates Ray.

When she interrupts a burglary at home, Diane Pranske is abducted and left for dead across state lines; detectives turn to surveillance video to find her assailant, and investigators try to get justice for this brutal crime.

When a young mother of two is found brutally murdered at home, suspicion falls on her friends; detectives zero in on multiple suspects who tell different stories, and they don't know who to trust.

Mac is charged with misconduct and breach of ethics when she admits to looking at evidence forbidden to the prosecution.

Warren Jeffs takes over as prophet of the FLDS, a small religious sect that practices polygamy, and names one of his many wives, Naomie, his personal scribe; she joins him on a quest to avoid interest from law enforcement regarding his deviances.

The rise to power of polygamist cult leader Warren Jeffs, told for the first time by the woman who accompanied him on his run from the law.

The law finally catches up to Warren, but he still controls the FLDS faithful from behind prison walls; his legal troubles worsen when authorities raid his Texas compound and uncover disturbing evidence, some directly from Naomie, involving minors.

Warren faces life in prison when the authorities charge him for crimes against children; disenfranchised members, including Naomie, reconcile with their lives after leaving the FLDS.

The team gets a new lead in the mole investigation after an unknown assailant kills two men disguised as sheriff's deputies in front of Callen's home; Nell interviews a prison inmate who has information on the department's leak.

NCIS looks into the disappearance of a Navy lieutenant commander who is working on foreign cyber threats with the NSA; the team celebrates the holidays.

Locals angered by a land dispute catch Gunny by surprise while he is transporting a prisoner, ambushing both of them before the 67-year-old private can face a court-martial.

The team's investigation into a lieutenant's death is connected to a citywide blackout.

Warren Jeffs takes over as prophet of the FLDS, a small religious sect that practices polygamy, and names one of his many wives, Naomie, his personal scribe; she joins him on a quest to avoid interest from law enforcement regarding his deviances.

The rise to power of polygamist cult leader Warren Jeffs, told for the first time by the woman who accompanied him on his run from the law.

The law finally catches up to Warren, but he still controls the FLDS faithful from behind prison walls; his legal troubles worsen when authorities raid his Texas compound and uncover disturbing evidence, some directly from Naomie, involving minors.

Warren faces life in prison when the authorities charge him for crimes against children; disenfranchised members, including Naomie, reconcile with their lives after leaving the FLDS.

Warren Jeffs takes over as prophet of the FLDS, a small religious sect that practices polygamy, and names one of his many wives, Naomie, his personal scribe; she joins him on a quest to avoid interest from law enforcement regarding his deviances.

The rise to power of polygamist cult leader Warren Jeffs, told for the first time by the woman who accompanied him on his run from the law.

The law finally catches up to Warren, but he still controls the FLDS faithful from behind prison walls; his legal troubles worsen when authorities raid his Texas compound and uncover disturbing evidence, some directly from Naomie, involving minors.

A look at some of the wildest courtroom moments: a cold-blooded killer shares the details of a grisly murder, and a neo-Nazi couple show no remorse for their heinous crimes.

On August 17, 1994, in Kelowna B.C., eight-year-old Mindy Tran hopped on her bike and pedaled over to a nearby friend's house to ask her to play; she was never seen again.

Andy and Gail go under cover at a drug-riddled club; Traci struggles with her feelings for detective Barber; a woman files a complaint against Dov; Andy opens up to Sam.

Andy and Swarek investigate the theft of severed heads for a medical lab; Andy puts Luke and herself in danger.

Ray becomes jealous when Fraser gets all the media attention during a terrorist's trial, but both lawmen take center stage after they are held as hostages.

Fraser develops amnesia when he is thrown from the back of a speeding van, and Ray struggles to help his partner regain his memory.

When a young mother of two is found brutally murdered at home, suspicion falls on her friends; detectives zero in on multiple suspects who tell different stories, and they don't know who to trust.

A quiet town is shaken to its core when an innocent woman is gunned down in broad daylight; detectives desperately act to find her killer and restore the peace.

When Mac goes under cover in a naval officer's coven to investigate allegations of sexual misconduct against him, she finds herself falling under his spell.

Every day, tens of thousands of people get booked into jails all across the country for crimes, both big and small; "Booked: First Day In" is their side of the story.

First-timers and frequent flyers get booked, including the son of a deputy who is charged with stealing a dog he's been caring for.

A career criminal and first-time arrestee bond in custody; an expecting father faces the prospect of missing his child's birth; a 20-year-old aspiring model gets a taste of the inside of a jail cell for the first time.

Two fathers get into an altercation; a guy gets caught when he uses fake urine for a drug test; a lady sets her boyfriend's things on fire.

After a Navy reservist is killed protecting a city councilman, Sam goes under cover in a private security firm that has links to criminal organizations.

Callen, Sam, Granger and Deeks get arrested as the result of planted evidence on the day Under Secretary Duggan arrives for Hetty's resignation.

Harm and Mac travel to Bahrain to investigate a Marine found aboard a terrorist boat that attacked a U.S. Naval destroyer.

Thanksgiving plans are put on hold while the team investigates the horrific death of a Marine.

Every day, tens of thousands of people get booked into jails all across the country for crimes, both big and small; "Booked: First Day In" is their side of the story.

First-timers and frequent flyers get booked, including the son of a deputy who is charged with stealing a dog he's been caring for.

A career criminal and first-time arrestee bond in custody; an expecting father faces the prospect of missing his child's birth; a 20-year-old aspiring model gets a taste of the inside of a jail cell for the first time.

Two fathers get into an altercation; a guy gets caught when he uses fake urine for a drug test; a lady sets her boyfriend's things on fire.

Every day, tens of thousands of people get booked into jails all across the country for crimes, both big and small; "Booked: First Day In" is their side of the story.

First-timers and frequent flyers get booked, including the son of a deputy who is charged with stealing a dog he's been caring for.

A career criminal and first-time arrestee bond in custody; an expecting father faces the prospect of missing his child's birth; a 20-year-old aspiring model gets a taste of the inside of a jail cell for the first time.

Two fathers get into an altercation; a guy gets caught when he uses fake urine for a drug test; a lady sets her boyfriend's things on fire.

Two Eritrean refugees looking for a better life in Canada are murdered; 55-year-old Nighisti Semret is stabbed walking home from work; The remains of 28-year-old Rigat Ghirmay are discovered by a dog walker in a west-end park.

As the cops try to recover from an explosive event, they must also investigate a series of arsons; a man from Chris' past emerges.

Chris and Dovare are trapped in a dangerous meth house during a sting operation; Luke helps Jo with a surveillance job in a hotel room.

Fraser returns from vacation to a blazing apartment and a new partner, Stanley Ray Kowalski.

Fraser helps Kowalski confront a demon from his past; Internal Affairs investigates the detective division.

A quiet town is shaken to its core when an innocent woman is gunned down in broad daylight; detectives desperately act to find her killer and restore the peace.

Shopkeeper Imran Ashgar is shot dead in his store in Columbus, Ohio; with the killers on the run, detectives are in a race against time to capture them before they strike again.

Chegwidden finds evidence that government officials hid information about the attack on Pearl Harbor.

Junior is torn between his duties and his feelings for his former girlfriend when her new man is one of the culprits in a bank heist-turned-homicide.

Tani and Junior go under cover at a gym to track down a deadly batch of steroids; Danny and McGarrett work as bodyguards for Danny's high maintenance ex-mother-in-law, a famous romance novelist with whom he has never gotten along.

Gibbs, still recovering from his gunshot wound, pushes the team to investigate the body of a bludgeoned sailor, found at an illegal nightclub.

Gibbs and his team track a former Navy SEAL (guest star Tim Abell) who escapes from prison looking for revenge.

When Hetty goes rogue, she leaves the NCIS team completely in the dark; the mole kidnaps one of the agents.

An NCIS agent is held at an unknown location and tortured by the mole, and another agent discovers he was betrayed by someone he least expected.

While on liberty in Mazatlan, Mexico, Bud's brother Mikey is charged with murder during a barroom brawl.

The NCIS team investigates when a Marine corporal who is an amateur race car driver is in a fatal crash on the track.

Junior is torn between his duties and his feelings for his former girlfriend when her new man is one of the culprits in a bank heist-turned-homicide.

Tani and Junior go under cover at a gym to track down a deadly batch of steroids; Danny and McGarrett work as bodyguards for Danny's high maintenance ex-mother-in-law, a famous romance novelist with whom he has never gotten along.

After a Navy commander is murdered on a beach, the team watches for a nude female sunbather who may be the only witness.

Ducky and Abby help identify a Marine whose severed leg is found in a trash receptacle, then the case takes a turn when the man's identity does not match his official photo ID.

When Hetty goes rogue, she leaves the NCIS team completely in the dark; the mole kidnaps one of the agents.

An NCIS agent is held at an unknown location and tortured by the mole, and another agent discovers he was betrayed by someone he least expected.

Chegwidden finds evidence that government officials hid information about the attack on Pearl Harbor.

The NCIS team investigates when a Marine corporal who is an amateur race car driver is in a fatal crash on the track.

On September 28, 2011, 19-year-old Maple Batalia, an aspiring model, actress and doctor, is shot and killed in a university campus parking lot; security camera footage pans away at the last moment, leaving her last minutes alive a mystery.

A notorious gang appears to be involved in the murder of a police informant; Detective Rosati reveals something that puts Andy's relationship with Luke in danger.

Andy worries her personal problems are affecting her professionally when a woman is brutally attacked on her watch; Luke's erratic behavior leads to him being kicked off a case.

Fraser and Kowalski try to thank a man for saving a boy's life and inadvertently reveal his identity as a federal witness.

Fraser and Kowalski protect Kowalski's ex-wife and her new boyfriend, a politician who has been receiving death threats.

Shopkeeper Imran Ashgar is shot dead in his store in Columbus, Ohio; with the killers on the run, detectives are in a race against time to capture them before they strike again.

A family's nightmare begins in September 2014 when 8-year-old Hiawayi Robinson leaves her apartment to play but never returns; the desperate search to find her leads investigators to surveillance footage that sends shockwaves through the community.

A Navy SEAL Medal of Honor recipient embroils Harm in a dangerous mission to expose power-hungry people falsely claiming to be Navy SEALs.

The team investigates the murder of a window washer and finds that the victim is actually a renowned street artist; Grover and Adam look into the murder of a gambler; Junior helps his father when they are reminded of his sister's death.

When the team must locate a girl who purchased a gun from a junkie, it discovers that the firearm, over the course of decades, has affected all of the teammates' lives.

Gibbs and his team are called to investigate when a fellow NCIS agent is found murdered. Guest star: Tim Kelleher.

When a Marine explosives expert disappears outside a nightclub, Gibbs and his agents are summoned to investigate.

While investigating the kidnapping of a retirement home resident, the NCIS team discovers a pair of con artists who go from home to home scamming the elderly out of their money; Callen confronts his father on his illegal activity.

Sam assumes a former alias in a risky undercover operation to take down an elusive drug lord; Hetty interrupts Callen and Anna's romantic night to assign them a mission to escort a prisoner.

Clark Palmer, Harm's old nemesis, claims to be able to clear his prison buddy, Marine Sgt. Krohn of charges of attempted murder.

Pride needs to protect a family friend engaged to the prime suspect in an ongoing NCIS and FBI cartel case.

The team investigates the murder of a window washer and finds that the victim is actually a renowned street artist; Grover and Adam look into the murder of a gambler; Junior helps his father when they are reminded of his sister's death.

When the team must locate a girl who purchased a gun from a junkie, it discovers that the firearm, over the course of decades, has affected all of the teammates' lives.

A sniper kills Marine recruiters and leaves a white feather behind as his calling card.

The team's investigation into a lieutenant's death is connected to a citywide blackout.

While investigating the kidnapping of a retirement home resident, the NCIS team discovers a pair of con artists who go from home to home scamming the elderly out of their money; Callen confronts his father on his illegal activity.

Sam assumes a former alias in a risky undercover operation to take down an elusive drug lord; Hetty interrupts Callen and Anna's romantic night to assign them a mission to escort a prisoner.

A Navy SEAL Medal of Honor recipient embroils Harm in a dangerous mission to expose power-hungry people falsely claiming to be Navy SEALs.

Pride needs to protect a family friend engaged to the prime suspect in an ongoing NCIS and FBI cartel case.

A series of calls to 911 leads first responders to multiple scenes and the disturbing discovery of a young woman's body.

Division 15 is placed under quarantine when a man collapses from a mysterious illness; Dov's date with an attractive bomb technician ends unexpectedly.

Gail and Dov work with Swarerk as they try to protect an informant from a dangerous gang; Chris and Andy participate in competitive equine training.

Kowalski and Fraser begin an investigation that reveals the dark side of boxing after one of Kowalski's students injures someone in the ring.

While the police force is on strike, Fraser and Kowalski help a bounty hunter find a bail jumper from Montana.

A family's nightmare begins in September 2014 when 8-year-old Hiawayi Robinson leaves her apartment to play but never returns; the desperate search to find her leads investigators to surveillance footage that sends shockwaves through the community.

New Mexico State Police are called in to investigate when loving couple Gary and Linda Haas fail to reach their vacation campsite; with no forensic evidence and no witnesses, all they can do is scour CCTV footage for clues to unravel the mystery.

Harm reopens a 10-year-old murder case and incurs the wrath of the victim's daughter (Trisha Yearwood).

A murdered man's body may hold the key to a 20-year-old case involving a kidnapped girl whose father never stopped looking for her.

Adam investigates the murder of an undercover FBI agent who was about to wed the daughter of a Yakuza leader; Noelani is held hostage and forced, along with her mentor Dr. Chu, to operate at gunpoint on a criminal.

Gibbs and his team are called to investigate when the grisly remains of a Marine ordnance specialist are found.

Gibbs and his team believe the accidental death of a Navy SEAL, during a routine exercise, was murder.

Nell and Eric go under cover to track a tech-savvy husband and wife linked to the hacking of the U.S. Treasury Department; a digital forensics specialist arrives from the NCIS cyber office in San Diego to run operations in Eric and Nell's absence.

Callen and Sam go under cover to track an engineer attempting to sell classified information; Deeks plans a surprise for Kensi and her friends.

After a near-accident Harm and Mac investigate the Osprey, a controversial Marine Corps helicopter/airplane.

Sebastian goes under cover; Patton practices his old gambling skills; Pride and the team embark on a perilous plan to trap Garcia.

A murdered man's body may hold the key to a 20-year-old case involving a kidnapped girl whose father never stopped looking for her.

Adam investigates the murder of an undercover FBI agent who was about to wed the daughter of a Yakuza leader; Noelani is held hostage and forced, along with her mentor Dr. Chu, to operate at gunpoint on a criminal.

With the help of a local sheriff, Gibbs and his team hunt down a possible serial killer targeting naval officers.

Thanksgiving plans are put on hold while the team investigates the horrific death of a Marine.

Nell and Eric go under cover to track a tech-savvy husband and wife linked to the hacking of the U.S. Treasury Department; a digital forensics specialist arrives from the NCIS cyber office in San Diego to run operations in Eric and Nell's absence.

Callen and Sam go under cover to track an engineer attempting to sell classified information; Deeks plans a surprise for Kensi and her friends.

Harm reopens a 10-year-old murder case and incurs the wrath of the victim's daughter (Trisha Yearwood).

Sebastian goes under cover; Patton practices his old gambling skills; Pride and the team embark on a perilous plan to trap Garcia.

The horror of the "Wells Gray Murders" still haunts investigators involved in the case and family and friends of the victims; in August 1982, David Shearing stalked and murdered three generations of a family while they were on a summer camping trip.

Andy and Swarek come across a car accident while pursuing a child and his kidnapper; Chris fights with Dov over an indiscretion; Andy worries life is passing her by.

An undercover training exercise challenges Andy, Dov and Traci; Gail and Chris find a tied-up teenager at a graveyard.

Kowalski, Welsh and Thatcher (Callum Keith Rennie, Beau Starr, Camilla Scott) all witness a murder at the mall, but can't agree on who did it.

When Fraser's friend intercepts a secret message, Fraser and Kowalski become entrapped in a deadly arms transaction.

New Mexico State Police are called in to investigate when loving couple Gary and Linda Haas fail to reach their vacation campsite; with no forensic evidence and no witnesses, all they can do is scour CCTV footage for clues to unravel the mystery.

When Marcel Reardon is discovered bludgeoned to death outside an apartment building, his friends deny all knowledge of his murder; detectives are convinced at least one of them is lying.

A mishap blamed on Bud's brother during a training exercise ignites a tense conflict with international ramifications between the Navy and the Marines.

McGarrett helps his sister spy on her shady neighbors; a ride-share driver and his passenger are murdered; the team teases the youngest members when Junior escorts Tani to a wedding.

Five-0 continues to hunt down escaped criminal Aaron Wright before he can sell cyber-weapons to the highest bidder; the lives of McGarrett and the team members are put in danger when a visitor comes to headquarters to make amends.

Gibbs finally comes face to face with Ari, the Bete Noir terrorist who had wounded him before escaping.

The team investigates when a Navy commander's body washes ashore along with the bodies of two drug traffickers.

The team investigates when a defense contractor designing a nuclear attack weapon is suspected, by her husband, of selling Navy secrets to a foreign government.