Following Callen's public shooting of the Chameleon, all is not well with the NCIS: LA team, as Callen is placed on suspension and Hetty adjusts to retired life.

Harm, Mac and Bud fly to Miami to investigate the actions of three retired Navy operatives conducting a private war against drug pushers.

The NCIS team tries to narrow down the motive when a Navy recruiter is murdered in a hit-and-run; Lasalle worries about his brother.

In a small town located less than an hour from Canada's largest military base, a rash of break-ins escalates to assault and then murder; tire tracks point police to someone above suspicion.

After tracking a gun found at a frat house, Division 15 goes under cover at a bar that is supplying illegal firearms; Dov becomes suspicious of Chris' behavior; Andy helps Sam with a missing person case.

The investigation into the discovery of a missing man's body in the trunk of a car leads Andy and Sam to someone with a surprising connection to Sam; Traci thinks they have the wrong suspect.

Ice-fisherman Fraser catches a corpse, finds another, and gets chased by bad guys with grenade launchers.

Fraser and Kowalski pursue an arms dealer to the Yukon, where they join forces with Buck Frobisher's (Leslie Nielsen) detachment.

In 2014, graduate student Tequila Suter is stabbed to death in her suburban Buffalo home; investigators' only hope of solving the case is to piece together a trail of CCTV across town and follow in the footsteps of a killer.

In Fontana, Calif., a bizarre traffic accident takes the life of 18-year old Cristian Dominguez Aguilar; the driver vanishes into thin air, so police turn to surveillance video for answers.

Mac's boyfriend uses evidence from her files against Harm in a sexual harassment case aboard an aircraft carrier.

McGarrett turns to Odell Martin (Michael Imperioli) for help when a confidential informant is accused of murder.

A Russian spy steals a flash drive containing classified information that puts a Five-0 member at risk; McGarrett learns why Catherine left; Abby keeps her mission a secret.

An openly gay Navy lieutenant set to receive the Medal of Honor is murdered; Palmer gets ready for fatherhood.

A murdered Marine and alumnus of the military academy DiNozzo attended is found with a student's photograph in his hand; Bishop and her husband ask Gibbs and the team to dinner.

A drone strike on a bomb-making compound in Afghanistan leads to the discovery of a retired Marine's remains.

The team investigates an intel operation after four people connected to the project die in a diner explosion.

Bud's first big case involves a Navy SEAL who is being held liable in the deaths of three U.N. peacekeepers.

Pride believes Baitfish has returned and has the NCIS team chase down leads in an attempt to locate him.

McGarrett turns to Odell Martin (Michael Imperioli) for help when a confidential informant is accused of murder.

A Russian spy steals a flash drive containing classified information that puts a Five-0 member at risk; McGarrett learns why Catherine left; Abby keeps her mission a secret.

When a young sailor's body is found in an abandoned building in a seedy part of town, an ominous message written in blood leads the team to switch gears to find the killer.

The NCIS team suspects foul play when a Navy lieutenant is the victim of radiation poisoning; Tony sees a softer side of Ziva.

A drone strike on a bomb-making compound in Afghanistan leads to the discovery of a retired Marine's remains.

The team investigates an intel operation after four people connected to the project die in a diner explosion.

Mac's boyfriend uses evidence from her files against Harm in a sexual harassment case aboard an aircraft carrier.

Pride believes Baitfish has returned and has the NCIS team chase down leads in an attempt to locate him.

When the key suspect in a series of assaults and murders is brought in for questioning, a cat and mouse game unfolds in the interview room and ultimately leads to a shocking confession from a man leading a secret double life.

At his dismissal hearing, Duncan reveals new incriminating evidence against Andy; Oliver considers making a deal.

Dov suspects Chris isn't ready to get back on the right track; Steve tells Traci he's about to raid a gambling den frequented by her husband.

Fraser gets temporary custody of a 12-year-old purse snatcher who is connected to the armed robbery he and Ray are investigating.

Fraser and Ray investigate an insurance scam involving professional boxing while a wolf cruises Chicago looking for a good time.

In Fontana, Calif., a bizarre traffic accident takes the life of 18-year old Cristian Dominguez Aguilar; the driver vanishes into thin air, so police turn to surveillance video for answers.

In May of 2013, 36-year-old Army veteran Maribel Ramos disappears from her Orange, Calif. apartment without a trace; suspecting foul play, investigators devise a unique surveillance strategy to track her down and uncover some disturbing evidence.

Mac starts drinking again after her possessive ex-boyfriend is killed in a car-jacking, but she is still followed by an unknown stalker.

The body of a man left for dead off the coast of Oahu leads Five-0 to a deadly slave trade business that is operating aboard a fishing vessel.

Grover is forced to take his family on the run when a dangerous mob boss seeks revenge for a 15-year-old case.

When an explosion rocks a summit on global terror, the team suspects Gibbs' archenemy is responsible; Gibbs tries to help Fornell after his wife's murder.

A murder victim turns out to have been living under an alias created for one of Gibbs' undercover cases from 20 years ago.

When a U.S. senatorial candidate's staffer is run over and killed while crossing the street, the team must determine if it was an accident or a murder than could put others in danger.

A CIA agent who once worked with Sam seeks his help before dying of an apparent suicide; while working under cover, Deeks and Kensi enter a prized poodle in a dog show.

While searching for Agent Clayton Webb's killer, Harm and Mac stumble upon a rogue government spy agency.

When a sailor is killed in a strip club, the murder weapon turns out to be linked to other unsolved cases; Brody receives a visit from her ex-fiance.

The body of a man left for dead off the coast of Oahu leads Five-0 to a deadly slave trade business that is operating aboard a fishing vessel.

Grover is forced to take his family on the run when a dangerous mob boss seeks revenge for a 15-year-old case.

When an explosion at a military cemetery's mausoleum reveals a cache of dismembered human remains, the team searches for a potential serial killer.

With a young Marine on life support, the team tracks his movements in the days leading up to his being left for dead.

When a U.S. senatorial candidate's staffer is run over and killed while crossing the street, the team must determine if it was an accident or a murder than could put others in danger.

A CIA agent who once worked with Sam seeks his help before dying of an apparent suicide; while working under cover, Deeks and Kensi enter a prized poodle in a dog show.

Mac starts drinking again after her possessive ex-boyfriend is killed in a car-jacking, but she is still followed by an unknown stalker.

When a sailor is killed in a strip club, the murder weapon turns out to be linked to other unsolved cases; Brody receives a visit from her ex-fiance.

What started as a petty falling out between a group of high school friends led to the creation of two rival gangs; over a decade the animosity between the "FK's and FOB's" gangs grew as did their illicit activity.

When the Division helps tenants move out of a condemned subsidized-housing complex, they discover a badly beaten man in one of the empty units.

When a car bomb explodes in a downtown parking garage, a newly reinstated Duncan goes rogue in an effort to prove himself.

Fraser offers to help a former Mountie who is on the run when a serial killer he put away escapes from prison.

The trail of bad meat that sickened a child leads Fraser and Ray to horse auctions; guests Kaye Ballard, Richard Moll.

In May of 2013, 36-year-old Army veteran Maribel Ramos disappears from her Orange, Calif. apartment without a trace; suspecting foul play, investigators devise a unique surveillance strategy to track her down and uncover some disturbing evidence.

Sixteen-year-old Diamond Bradley mystifies her family when she suddenly disappears; detectives hope surveillance footage will lead them to the missing girl, but the trail Diamond leaves behind is more terrifying than anyone expected.

Harm and Bud try to stop terrorists who have taken over a Navy frigate with the hope of attacking Cuba.

The team investigates the theft of high-tech indestructible suits made for the military; Jerry and his sister try to save a captive elephant.

When a deliberate chemical spill enables six dangerous inmates to escape, the team goes on an intensive manhunt to find them.

The team investigates the world of black market art when evidence in a murder case reveals that a rare painting has been swapped for a fake.

When a dead thief is found in a Marine's home, the NCIS team finds the calling card of a terror group the Department of Defense had been tracking.

A CIA agent's death leads the team to a group of dangerous Russian agents; Hanna worries a secret will be exposed.

The team investigates potential links among a dead naval tech scientist, a surfer and an Internet video; Kensi and Deeks go under cover as they pursue suspects.

Lt. Curtis Rivers is captured by separatists who threaten to hang him for his apparent part in the death of a 14-year-old boy.

During the autopsy of a petty officer who seems to have died of natural causes, an armed man holds Wade, Sebastian and Danny hostage in the morgue.

The team investigates the theft of high-tech indestructible suits made for the military; Jerry and his sister try to save a captive elephant.

When a deliberate chemical spill enables six dangerous inmates to escape, the team goes on an intensive manhunt to find them.

Cassidy (Jessica Steen) blames herself when the team learns that a tip on terrorist activity was a trap that resulted in the deaths of two agents.

When a petty officer on whom McGee based a character for his latest book is murdered, McGee must figure out who could have accessed his secret manuscript.

A CIA agent's death leads the team to a group of dangerous Russian agents; Hanna worries a secret will be exposed.

The team investigates potential links among a dead naval tech scientist, a surfer and an Internet video; Kensi and Deeks go under cover as they pursue suspects.

Harm and Bud try to stop terrorists who have taken over a Navy frigate with the hope of attacking Cuba.

During the autopsy of a petty officer who seems to have died of natural causes, an armed man holds Wade, Sebastian and Danny hostage in the morgue.

A dispute outside a Toronto tavern between a jealous boyfriend and several gang members ends in a hail of gunfire, in which a young woman new to the city is killed, and the missing gun turns up in an unrelated crime.

A bomb goes off in the station's evidence room, with Andy inside.

Andy and Sam return to work; Andy is attacked at Traci's place and Sex Crimes Unit tries to take over the case.

Fraser and Ray go under cover to expose a crooked auto dealership selling -- then stealing and recycling -- used cars.

Fraser and Ray (Paul Gross, David Marciano) help a restaurant owner whose son has been kidnapped by the Chinese mob.

Sixteen-year-old Diamond Bradley mystifies her family when she suddenly disappears; detectives hope surveillance footage will lead them to the missing girl, but the trail Diamond leaves behind is more terrifying than anyone expected.

In 2017, a neighbor finds the body of 40-year-old Dawn Meade outside an apartment complex in Louisa, Va.; detectives must determine if this is an accidental death or something more sinister, so they turn to surveillance footage to uncover the truth.

Harm risks his career during the murder investigation of an old friend as he butts heads with a gritty Navy detective.

After exiting an upscale Manhattan night club, 26-year-old Joey informs his crew he's going to an after-party with a handful of people he just met, never to be heard from again; his family and friends help the NYPD to solve this famous case.

With 2,000 audience members watching a ballet at the world famous Metropolitan Opera House, orchestra violinist Helen takes a break and leaves her $20,000 violin on her chair, never to return.

Mama Edna, a pillar of the Haitian community in Brooklyn is adored by all as the matriarch of East Flatbush; when she is found murdered in her home, NYPD uncover a Voodoo practice that leads them to a web of the unthinkable.

A tight-knit Orthodox Jewish community is terrified when police respond to a mother's 911 call from her ransacked house to break down the locked bedroom door of her daughter, 18-year-old Aliza, to find Aliza naked and dead on the floor.

As the team investigates the murder of a wealthy, retired CIA agent, Hetty's knowledge of the case is questioned.

Gunmen in costumes orchestrate a strange and brazen heist that could impact the U.S. economy; Granger insists on a partnership with a hesitant Kensi.

When Harm and Mac investigate an international incident on a nuclear submarine, their relationship is tested by the cramped quarters.

A military family comes under suspicion when a boy finds a murder weapon and the team must track ownership of the gun.

After exiting an upscale Manhattan night club, 26-year-old Joey informs his crew he's going to an after-party with a handful of people he just met, never to be heard from again; his family and friends help the NYPD to solve this famous case.

With 2,000 audience members watching a ballet at the world famous Metropolitan Opera House, orchestra violinist Helen takes a break and leaves her $20,000 violin on her chair, never to return.

Mama Edna, a pillar of the Haitian community in Brooklyn is adored by all as the matriarch of East Flatbush; when she is found murdered in her home, NYPD uncover a Voodoo practice that leads them to a web of the unthinkable.

A tight-knit Orthodox Jewish community is terrified when police respond to a mother's 911 call from her ransacked house to break down the locked bedroom door of her daughter, 18-year-old Aliza, to find Aliza naked and dead on the floor.

After exiting an upscale Manhattan night club, 26-year-old Joey informs his crew he's going to an after-party with a handful of people he just met, never to be heard from again; his family and friends help the NYPD to solve this famous case.

With 2,000 audience members watching a ballet at the world famous Metropolitan Opera House, orchestra violinist Helen takes a break and leaves her $20,000 violin on her chair, never to return.

Mama Edna, a pillar of the Haitian community in Brooklyn is adored by all as the matriarch of East Flatbush; when she is found murdered in her home, NYPD uncover a Voodoo practice that leads them to a web of the unthinkable.

A tight-knit Orthodox Jewish community is terrified when police respond to a mother's 911 call from her ransacked house to break down the locked bedroom door of her daughter, 18-year-old Aliza, to find Aliza naked and dead on the floor.

A dispute outside a Toronto tavern between a jealous boyfriend and several gang members ends in a hail of gunfire, in which a young woman new to the city is killed, and the missing gun turns up in an unrelated crime.

Homocide analyst John Allore tirelessly probes unsolved murders in his ultimate quest to uncover the fate of his sister, Theresa, found dead in Quebec's Eastern Townships region in 1979.

Andy contemplates her future with Sam after learning heartbreaking news; Andy meets a teen in need of protection.

A riot erupts at an over-capacity women's correctional facility while Andy, Juliet, Nick and Gail are there to transfer inmates; a dangerous prisoner is desperate to prove her innocence to a trapped Andy and Juliet.

A mob killer tries to retrieve a matchbook's information; Fraser must chaperon a Canadian diplomat's wild daughter.

Ray manages to get his hands on the matchbook that could bring the city of Chicago crumbling down, while Fraser continues chaperoning the ambassador's wild daughter.

In 2017, a neighbor finds the body of 40-year-old Dawn Meade outside an apartment complex in Louisa, Va.; detectives must determine if this is an accidental death or something more sinister, so they turn to surveillance footage to uncover the truth.

When someone murders a Tennessee state trooper in the middle of a highway, investigators turn to his dashcam for answers; a manhunt quickly gets underway, but it takes even more surveillance video to pick up a killer's trail and crack the case.

Harm is held captive by a renegade government agent who plans to assassinate a key witness in an upcoming trial.

Nine-year-old Kamryn Johnson is supposed to be at gymnastics class when her mother, Sheraton, receives a frantic phone call saying Kamryn is being held captive for ransom; Kamryn's parents recount the frightening threats the alleged abductor made.

Those closest to Madison Nygard share the agonizing details around the beautiful 16-year-old's terrifying abduction as she walked home from a party; her mother, friends and authorities explain how Madison's attack would ultimately uncover clues.

The missing and murder rates of Indigenous women are disproportionately higher than any other group, so when beautiful Jalajhia Finklea vanishes the day before her 18th birthday, her Wampanoag tribe members immediately take action.

When mother-of-two Deanna Cook misses her daily call to her mom, her family worries that Deanna's stalker may have something to do with it; her family's 911 call falls on deaf ears and they are forced to make a discovery.

Sam, Callen, Deeks and Kensi spend Christmas on an aircraft carrier investigating an NCIS special agent's death; Eric and Nell celebrate the holidays at headquarters; Hetty goes on a trip.

One of Deeks' former defendants is targeted for uncovering information that could dismantle a car shipping operation with ties to a global terrorist ring.

Harm and a Navy Reserve pathologist investigate the death of a child whose body was found on a military base.

Gibbs reluctantly works with Trent Kort (David Dayan Fisher) to put away one of the department's most-wanted criminals.

Nine-year-old Kamryn Johnson is supposed to be at gymnastics class when her mother, Sheraton, receives a frantic phone call saying Kamryn is being held captive for ransom; Kamryn's parents recount the frightening threats the alleged abductor made.

Those closest to Madison Nygard share the agonizing details around the beautiful 16-year-old's terrifying abduction as she walked home from a party; her mother, friends and authorities explain how Madison's attack would ultimately uncover clues.

The missing and murder rates of Indigenous women are disproportionately higher than any other group, so when beautiful Jalajhia Finklea vanishes the day before her 18th birthday, her Wampanoag tribe members immediately take action.

When mother-of-two Deanna Cook misses her daily call to her mom, her family worries that Deanna's stalker may have something to do with it; her family's 911 call falls on deaf ears and they are forced to make a discovery.

Nine-year-old Kamryn Johnson is supposed to be at gymnastics class when her mother, Sheraton, receives a frantic phone call saying Kamryn is being held captive for ransom; Kamryn's parents recount the frightening threats the alleged abductor made.

Those closest to Madison Nygard share the agonizing details around the beautiful 16-year-old's terrifying abduction as she walked home from a party; her mother, friends and authorities explain how Madison's attack would ultimately uncover clues.

The missing and murder rates of Indigenous women are disproportionately higher than any other group, so when beautiful Jalajhia Finklea vanishes the day before her 18th birthday, her Wampanoag tribe members immediately take action.

When mother-of-two Deanna Cook misses her daily call to her mom, her family worries that Deanna's stalker may have something to do with it; her family's 911 call falls on deaf ears and they are forced to make a discovery.

A cross-country manhunt ensues when a young Australian American couple is murdered, a much-loved university professor is found dead, and two teens go missing in northern British Columbia.

Nick receives new information on his tragic past, and goes off the grid to track someone down; Nick is forced to tell Juliet about his secrets.

When Traci fails to show up for a raid involving a notorious gun dealer, the officers of 15 Division race to find her.

Ray and Fraser search for the parents of an infant left in their car and discover the baby was headed for a black-market adoption.

When three Santas rob a bank, the only witness who saw one of the suspects unmasked refuses to cooperate.

When someone murders a Tennessee state trooper in the middle of a highway, investigators turn to his dashcam for answers; a manhunt quickly gets underway, but it takes even more surveillance video to pick up a killer's trail and crack the case.

The police lack leads after single mom Laura Ackerson leaves for work one morning and never returns, so they turn to surveillance cameras to try to locate her and unearth sinister footage.

Harm seeks the assistance of a forensic pathologist when the remains of a Navajo Indian who may have been a World War II hero are unearthed.

The team races to save an abducted college student from a dangerous vigilante; Max, Kamekona and Flippa struggle to survive after being shipwrecked.

The Five-0 team learns that one of its own has a deep connection to the young daughter of a woman who was murdered in her home.

A petty officer's murder results in a lead in a 40-year-old airport bombing case; McGee is upset that he was not briefed on the cold case.

When evidence calls for a joint investigation between NCIS and ATF, DiNozzo partners up with his girlfriend, Special Agent Zoé Keates; Anthony DiNozzo Sr. visits.

The members of the team go under cover as an elite tactical force in order to investigate a crime linked to a cartel kingpin.

Suspicious of a cover-up, a Marine's widow asks Sam and Callen to investigate her husband's last battle; the team thinks another evaluation is on the horizon.

A civilian electronics specialist is suspected of sabotage when an aircraft carrier loses power while in a no-fly zone of the Persian Gulf.

When a Navy commander's car is stolen with his baby inside, the team must determine if it was a targeted abduction.

The team races to save an abducted college student from a dangerous vigilante; Max, Kamekona and Flippa struggle to survive after being shipwrecked.

The Five-0 team learns that one of its own has a deep connection to the young daughter of a woman who was murdered in her home.

Gibbs and the team must take action after the director's risky solo meeting with an informant ends with a death.

The team turns to a blind photographer (John Billingsley) to use his heightened senses of hearing and smell to re-create a crime scene and track down a petty officer's killer.

The members of the team go under cover as an elite tactical force in order to investigate a crime linked to a cartel kingpin.

Suspicious of a cover-up, a Marine's widow asks Sam and Callen to investigate her husband's last battle; the team thinks another evaluation is on the horizon.

Harm seeks the assistance of a forensic pathologist when the remains of a Navajo Indian who may have been a World War II hero are unearthed.

When a Navy commander's car is stolen with his baby inside, the team must determine if it was a targeted abduction.

Two missing teens quickly turn into the prime suspects in the murders of three people, and officers follow a trail of clues across Canada into the vast wilderness of northern Manitoba.

A community-outreach baseball game is interrupted by a drive-by shooting; Sam plans a getaway with Andy.

When Sam and Andy discover that Oliver is the prime suspect in the evidence-room bombing, they become determined to clear his name.

Ray falls for a woman who saves his life and keeps mysteriously appearing during his investigation of a hit-and-run.

Fraser goes under cover in a mental institution to investigate a series of strange happenings among the patients.

The police lack leads after single mom Laura Ackerson leaves for work one morning and never returns, so they turn to surveillance cameras to try to locate her and unearth sinister footage.

A revealing look into how the deadliest crimes are solved by the only witnesses that never lie -- and where murderers have no place to hide: surveillance cameras.

Harm defends a fighter pilot accused by the Italian government of causing the crash of a sightseeing helicopter; guest Anne-Marie Johnson.

Five-0 tries to protect a wounded Gabriel and plan an escape when enemy gunmen storm the dilapidated building in which Gabriel is trapped.

McGarrett and Danny pose as drug pilots in a plan to stop a meth epidemic on the island; Danny is forced to break cover and land the plane when McGarrett is seriously wounded.

The team finds a link between a murder in Washington, D.C., and a terror group holding a Marine hostage overseas; DiNozzo is annoyed that McGee was chosen to be featured on recruitment brochures.

When a Navy ensign from the Office of Naval Intelligence is murdered, Special Agent Ned Dorneget (Matt Jones) from NCIS cyber operations helps investigate; Jake and Gibbs' friendship is revealed.

Callen must infiltrate a network of Chechen terrorists who are recruiting fighters to join their cause as they plan their next attack on the U.S.

An investigation leads the team to question the only survivor of a terrorist organization; Deeks and Kensi follow a trail into the woods.

In Bud's first case as a JAG attorney, he goes up against prosecutor Harm to defend his estranged father.

Lasalle's brother, Cade, needs the team's help when he becomes a murder suspect -- and cannot remember what happened; Lasalle is determined to prove Cade's innocence, despite the wealth of evidence against him.

Five-0 tries to protect a wounded Gabriel and plan an escape when enemy gunmen storm the dilapidated building in which Gabriel is trapped.

McGarrett and Danny pose as drug pilots in a plan to stop a meth epidemic on the island; Danny is forced to break cover and land the plane when McGarrett is seriously wounded.

Gibbs leads the investigation into a murder victim found in a taxi headed to NCIS headquarters; Jenny discovers a secret about her past.

Upon the director's return from a European junket, the team's secrets unravel; a merciless drug dealer holds Dinozzo and his girlfriend captive.

Callen must infiltrate a network of Chechen terrorists who are recruiting fighters to join their cause as they plan their next attack on the U.S.

An investigation leads the team to question the only survivor of a terrorist organization; Deeks and Kensi follow a trail into the woods.

Harm defends a fighter pilot accused by the Italian government of causing the crash of a sightseeing helicopter; guest Anne-Marie Johnson.

Lasalle's brother, Cade, needs the team's help when he becomes a murder suspect -- and cannot remember what happened; Lasalle is determined to prove Cade's innocence, despite the wealth of evidence against him.

In 1992, loved ones and police go to painstaking efforts to locate 26-year-old Dilleen Hempel after she goes missing while heading home from her new job.

Andy, Dov, Gail and Nick undertake a risky plan; Traci shadows Steve Peck, hoping to calm her fears about his involvement in the bombing.

When a heat wave strikes, 15 Division opens to the public as a cooling station; Andy and Marlo search for a missing woman.

Fraser and Ray (Paul Gross, David Marciano) teach a group of senior citizens to defend themselves against a mugger.

Ray reluctantly helps Fraser deliver an accused felon to Canadian authorities while ruthless thugs try to kill the criminal.

A revealing look into how the deadliest crimes are solved by the only witnesses that never lie -- and where murderers have no place to hide: surveillance cameras.

On July 5, 2011, a young couple on their way home from a night of birthday celebrations is shot while getting gas; with the killers long since vanished, detectives must rely on the grainy gas station video to unravel a senseless act of evil.

Chaos reigns during the three days leading up to Bud and Harriet's (Patrick Labyorteaux, Karri Turner) wedding. With David James Elliott and Catherine Bell.

The team hunts for a murderer who has been targeting serial killers, marking their corpses with an ivory chess piece.

A rogue MI-6 agent is the key to finding a terrorist who plans to cause the meltdown of nuclear reactors across Europe; McGarrett and Danny need the help of an FBI profiler to find a killer.

A case escalates into a global initiative when it's discovered that an international terrorist group that recruits children has been buying bombs off the black market.

After a deadly bombing overseas, the team pursues a global terrorist group -- and suffers an emotional loss.

Sam helps an Afghani elder and former friend search for his missing nephew; Callen worries that Sam is overly invested.

Sam fears for his family's safety when his wife is called to resume a former CIA cover after a case suggests ties to the infamous Sidorov and his stolen nuke.

Mac confronts her estranged father at his death bed; Harm undergoes laser surgery to cure his night-blindness.

Baitfish murders a person close to the team in order to send a message to Pride; a citywide hunt for the elusive criminal takes place.

The team hunts for a murderer who has been targeting serial killers, marking their corpses with an ivory chess piece.

A rogue MI-6 agent is the key to finding a terrorist who plans to cause the meltdown of nuclear reactors across Europe; McGarrett and Danny need the help of an FBI profiler to find a killer.

A showdown between the NCIS team and an elusive arms dealer reaches an explosive conclusion.

A showdown between the NCIS team and an elusive arms dealer reaches an explosive conclusion.

Sam helps an Afghani elder and former friend search for his missing nephew; Callen worries that Sam is overly invested.

Sam fears for his family's safety when his wife is called to resume a former CIA cover after a case suggests ties to the infamous Sidorov and his stolen nuke.

Chaos reigns during the three days leading up to Bud and Harriet's (Patrick Labyorteaux, Karri Turner) wedding. With David James Elliott and Catherine Bell.

Baitfish murders a person close to the team in order to send a message to Pride; a citywide hunt for the elusive criminal takes place.

After a man fired a gun on a local playground and seriously injured two girls, outraged parents demanded answers from local politicians as to how to stop the cycle of violence terrorizing their neighbourhoods.

Andy considers leaving town for a four-month-long undercover project; Jarvis reveals that the division will be restructured.

Andy is left stranded on the side of the road with a dying man and no way to get help on her wedding day.

Diefenbaker, impounded after straying from the apartment, sniffs up dog poaching and defends a husky.

Fraser assumes the responsibility of protecting a childhood friend who has become a professional hockey star.

On July 5, 2011, a young couple on their way home from a night of birthday celebrations is shot while getting gas; with the killers long since vanished, detectives must rely on the grainy gas station video to unravel a senseless act of evil.

In Alexandria, Va., Nancy Dunning, Ronald Kirby and Ruthanne Lodato are all fatally shot in broad daylight by a gunman knocking at the front door; detectives attempt to use security footage to track down the killer before they strike again.

Harm travels to Russia with Mac after uncovering evidence that his father is alive and living in Siberia.

After finding a corpse in her bed, FBI profiler Alicia Brown joins McGarrett in a hunt for a killer; Kono reconnects with a former surfing competitor.

When the serial killer that Alicia and McGarrett have been hunting kidnaps them, it's up to Five-0 to find them before it's too late.

Gibbs fights for his life on a Navy hospital ship, while DiNozzo and Joanna go to Shanghai to take down the Calling.

When Gibbs asks the team to help DEA Agent Luis Mitchell with a case, DiNozzo makes a discovery about Gibbs' connection to the agent; Gibbs debuts a new look.

Callen and Sam work with NCIS: Red, a mobile team of agents, when a murder weapon in Idaho matches one used in a national security case in Los Angeles.

The Los Angeles team and NCIS: Red continue their urgent search for an elusive terrorist before he disappears.

Harm consults his psychiatrist girlfriend when he begins to see and hear his deceased father and suspects something more sinister is involved.

Pride has suspicions about a mole; new intelligence comes to light that indicates a breach at the ports.

After finding a corpse in her bed, FBI profiler Alicia Brown joins McGarrett in a hunt for a killer; Kono reconnects with a former surfing competitor.

When the serial killer that Alicia and McGarrett have been hunting kidnaps them, it's up to Five-0 to find them before it's too late.

Ducky makes a startling discovery that leads to the search for a missing child; Tony struggles to deal with his feelings for Jeanne.

Gibbs and Lt. Col. Mann investigate the murder of a Marine captain who had access to highly classified information; a witness in the case turns out to be Gibbs' ex-wife.

Callen and Sam work with NCIS: Red, a mobile team of agents, when a murder weapon in Idaho matches one used in a national security case in Los Angeles.

The Los Angeles team and NCIS: Red continue their urgent search for an elusive terrorist before he disappears.

Harm travels to Russia with Mac after uncovering evidence that his father is alive and living in Siberia.

Pride has suspicions about a mole; new intelligence comes to light that indicates a breach at the ports.

Days after Stephanie Forster is killed near her home in Coquitlam, B.C., her estranged husband, Luigi Derossi, kills himself, but her brother believes Forster discovered Derossi's notoriety as a serial romance scammer.

Andy faces a volatile gunman after a high-stakes takedown of a suspect does not go as planned.

The rookies hunt for a violent escaped convict; Andy and her training officer search for a missing informant.

Fraser and Ray help a shoemaker being terrorized by a mobster who was a schoolyard bully Ray feared as a child.

After delivering a package to the wrong woman, Fraser's attempts to retrieve it make the woman's suspicious fiance violent.

In Alexandria, Va., Nancy Dunning, Ronald Kirby and Ruthanne Lodato are all fatally shot in broad daylight by a gunman knocking at the front door; detectives attempt to use security footage to track down the killer before they strike again.

On March 27, 2015, Tierra Hall hugs her mother goodbye for the last time; 24 hours later, the teenager's dead body is discovered outside an abandoned house.

Adm. Chegwidden travels to Moscow to begin his own investigation after hearing reports that Harm and Mac perished there in a plane crash.

A cache of guns is stolen by a person looking to make a statement on gun violence; Kono and Adam are reunited.

On Halloween, the team investigates the murder of a medium who was apparently frightened to death by a poltergeist; a mysterious death cult kidnaps Kono and Adam.

Hours after calling Gibbs about a possible case, a Marine is found dead in Quantico; McGee and Bishop pose as a married couple.

Vance returns to field duty -- with Gibbs as his partner -- when a murder investigation has a connection to a former NCIS agent incarcerated for stealing evidence.

The team investigates when cyanide in a communal water jug kills a lieutenant and leaves a Navy pilot in serious condition.