Human remains from a 150-year-old slave ship surface; the investigation leads Booth and Brennan to a cruise where a murder victim is seen moments before his death.

An event for a candymaker (Wayne Knight) turns bitter when human remains are discovered in the world's largest chocolate bar; Cam struggles with her daughter's decision to attend a college that fails to meet her high standards.

Brennan and Booth investigate a crime scene where a human carcass has melted to the dashboard of a charred truck; Sweets tries to keep his feelings for Daisy from interfering while helping her pass a government psychological evaluation.

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

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.

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.

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

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.

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.

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

While Pride remains on probation after his rogue takedown of the corrupt Mayor Hamilton, his team is closely monitored by a strict supervisor; the team must secretly investigate after the FBI takes the lead on a case involving stolen nuclear waste.

Grover must prevent a man who is accused of killing his wife from committing suicide.

The corpse of a diamond smuggler is stolen from a graveyard; Five-0 tracks down his partner, who is determined to retrieve their latest batch of contraband; Adam recruits a new, confidential informant; Tani gets a devastating call.

McGarrett and Danny investigate the murder of a private detective whose client was killed the same way; Adam sends Jessie into a dangerous situation with disastrous consequences; Danny's uncle comes to town to help with the restaurant.

Tani and Junior go under cover as prospective parents to infiltrate a private school where the headmaster was murdered; Adam's life is on the line when he is held captive and forced to produce a massive amount of money.

Adam's mission to take down organized crime goes sideways when the bait he uses falls into the wrong hands; Adam begins to doubt Jessie's allegiance.

The ex-wife of the man who shot Danny reveals how Danny helped save her life; Tani and Junior are assigned to walk the beat as uniformed officers for the day; Adam is framed for the murder of the crime boss he has been tracking.

A hit man McGarrett's father failed to arrest comes to McGarrett to finally confess his crimes and admit where he buried his victims; Jessie makes a dangerous decision that could ruin Adam's life.

Catherine Rollins recruits McGarrett and Jerry to help track down uranium thought to be hidden on an abandoned Hawaiian island before a terrorist makes dirty bombs with it; Junior gets trapped in a ravine.

Harry Langford enlists McGarrett and Danny's help to track down a teenage British royal who has run away while under his protection; Grover, Tani and Junior work a 25-year-old murder case after a mysterious videotape arrives at headquarters.

Duke is forced to steal crucial evidence from the police locker in exchange for his kidnapped granddaughter; Jerry goes under cover at a mental health facility to solve a murder.

McGarrett and Five-0 take on the mob when a former boss is killed; Junior's friend is on the run after witnessing the murder.

McGarrett joins Junior and his SEAL team on a mission to capture an elusive person who is holding his mentor hostage; Gerard Hirsch and Kamekona help Grover and Tani on a murder case involving art stolen by Nazis during World War II.

The team discovers a Russian spy ring hiding on Oahu when a Russian submarine appears off the coast.

After McGarrett's CIA agent friend is killed, he lets himself be captured by the group he thinks is responsible to find the killer; Tani questions whether she should tell McGarrett about the murder weapon she found at Adam's house.

When a vacationing father on a flight to Honolulu is kidnapped and forced to parachute midflight, Danny, Tani and Junior track him through the jungle to discover that he may not be who he seems; McGarrett is threatened with a secret from his past.

A heat wave hits Oahu, contributing to a spike in crime; McGarrett and Danny hunt down a bank thief; Tani and Junior's car is stolen while they're on duty; Kamekona incites a riot by price-gouging his ice.

After extinguishing a catastrophic tunnel fire, Team Scorpion helps Toby and Happy get to their wedding ceremony.

Team Scorpion has little hope for rescue after their plane crash-lands on a remote, deserted island while en route to Toby and Happy's honeymoon.

Tensions run high for members of Team Scorpion when they must overcome personal conflicts to be rescued from the desert island they crashlanded on three weeks earlier.

Team Scorpion must work with their old nemesis Mark Collins to prevent the extinction of mankind; Walter and Paige awkwardly navigate their new relationship.

Sebastian's life is in danger when a criminal he put behind bars escapes police custody; Carter is tasked with keeping Sebastian in protective custody; Carter and Hannah's flirtation is fun gossip fodder for Tammy and Sebastian.

After a Molotov cocktail is hurled into Pride's bar, evidence leads him to his old nemesis, Sasha Broussard; Tammy uses her profiling skills on Hannah and Carter with shocking accuracy.

The team investigates the deadly bar bombing and impending criminal turf war involving Sasha Broussard; Pride must come to terms with having Connor in his life; Carter and Hannah work to define their new relationship.

Pride directs the team to link Sasha to the recent attacks in New Orleans; Carter and Tammy search for a stolen highly trained military dog; Pride and Rita make an important decision about their wedding.

Pride and Rita plan their wedding; the FBI arrests Connor in connection to the bar's firebombing.

On the eve of his wedding to Rita -- and Connor leaving for the Witness Protection Program -- Pride must track down who attacked Jimmy and Connor, while he navigates Sasha's ulterior motives regarding her son.

The team investigates the death of a petty officer whom Pride had mentored; Brody searches for a place to call home.

When a Navy lieutenant on liberty dies of bubonic plague, NCIS Special Agent Tony DiNozzo helps the New Orleans team as they try to control a potential outbreak and find the source of the infectious disease.

An armored transport bus crashes, resulting in the escape of four prisoners -- including a black market broker topping the list of national security threats; Pride needs Gibbs' help with a case file full of redactions.

When a Navy SEAL is found dead in a sorority house, the team must determine if his death was related to collegiate foul play or a classified mission; Pride's daughter visits the office.

The investigation into a chief warrant officer's death reveals that his wife has been abducted -- leaving the team with a 22-hour deadline; senior FBI agent Fornell assists with the case.

Amidst Halloween festivities in New Orleans, a Naval Staff Judge Advocate dressed in a costume is found dead in a cemetery; the team debates Halloween costumes and activities.

The team investigate the murder of a Navy Officer assigned as a tech liaison with a private developer; Pride turns the carport into an auto shop.

A murdered petty officer -- with a proposal and an engagement ring -- is found in a Mardi Gras float storage facility; the members of the team are baffled when they cannot locate the victim's girlfriend.

The team reopens a cold case when a stolen Navy-issue gun turns out to belong to a chief petty officer who died 40 years ago; the team makes their annual Thanksgiving dinner together.

A retired SEAL -- who tracked people impersonating military personnel -- is murdered; Brody finds that LaSalle is uncharacteristically unenthusiastic about Christmas.

The investigation into an explosion at the Navy-Marine Corp Relief Gala reveals Pride was the bomb's target.

The NCIS team and the Coast Guard Investigative Service work together when a Navy Admiral's daughter is the prime suspect in a double murder on a research boat; Lasalle looks for his estranged brother.

After learning he was poisoned with a deadly dose of radiation, a Navy lieutenant commander asks Pride and the team to solve his imminent murder.

An agent is killed while working on a security detail for the Vice Chief of Naval Operations; Brody's past is evaluated.

Team Scorpion continues work with their nemesis to prevent humanity's extinction; Cabe's last-minute decision while on the case endangers his career.

When poachers almost kill a pregnant deer, the team tries to save the deer and the fawn; Happy and Toby discuss the future of their family.

While decommissioning an old nuclear missile, an accident causes the team to endure exposure to toxic vapor while trying to prevent the nuke from detonating; Paige confronts Happy about constantly tagging along with her and Walter.

While attending a tech convention, Team Scorpion is taken hostage by a group attempting a virtual heist.

Horatio delves into the world of modern treasure-hunting after a victim is found skewered to his yacht with a harpoon.

The team finds a rape victim clinging to life after being beaten, and Horatio suspects an imprisoned rapist is somehow responsible for the attack.

The team responds after a gifted 14-year-old tennis player is kidnapped from her bedroom in the middle of the night.

A masked gunman opens fire at a bar, leaving its two owners dead and a third man wounded. Jay Mohr and John Heard guest star.

The CSI team investigates when three people are found dead after a hurricane strikes Miami; Calleigh finds a woman shot to death in a house that was recently looted.

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

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 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.

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 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.

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.

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.

Catherine informs Five-0 that McGarrett's mother has been captured and is in danger of being executed for trying to free Wo Fat's imprisoned father; Chin is unable to delay Sara's adoption.

While Danny chaperones Grace's high school dance, the venue is seized by terrorists, who hold everyone hostage with the intent of abducting a diplomat's son; Danny and Grover discover that Will is Grace's secret boyfriend.

MacGyver hunts a U.S. government mole who is leaking classified information to the organization trying to take down the Phoenix Foundation; Sarah comes back to help with the mission; Mac can't tell which side Nikki is on.

While returning from capturing a war criminal, Mac and Jack's helicopter crashes, allowing the prisoner to escape.

Mac and Jack must track down a corrupt FBI agent who has framed a man for murder; everyone on the team is terrified to get a performance review from the tough new boss.

When Matty's goddaughter and her boyfriend are killed in a San Francisco park, Mac and the team investigate the crime and start to suspect that the 1970s Zodiac Killer has returned.

While Mac and Jack are tracking a dangerous fugitive, a family of bounty hunters kidnap him; Bozer and Riley try to hack into Jack's CIA file.

When Mac and the team are blamed for a terrorist bombing, the Phoenix Foundation is forced to disavow them; the team must clear their names without support from back home.

After an earthquake in Hawaii, Mac and the team join Chin and Kono from the Five-0 task force to rescue a group of government scientists trapped in a building; another group tries to steal top-secret weaponry from the scientists.

Mac's close friend from M.I.T. fakes her own death to prevent someone from killing her to suppress her scientific research.

The team searches for a commonality when a series of target abductions take place; Savannah is frustrated with Morgan's traveling.

When people are killed by arsenic poisoning and handwritten death threats are found, the team pursues a suspect fascinated by Greek mythology; Hotch is worried about participating in a Career Day at Jack's school.

When prostitutes are murdered in Texas, their deaths seem to have religious overtones; members of the team are put at risk throughout the course of the investigation.

The investigation in Texas reveals a deep web of corruption; Garcia must save a friend.

The team investigates a series of murders with unidentifiable victims in Bakersfield, Calif.; agent Kate Callahan joins the team.

The team members search for a vengeful suspect who was once abused; Garcia travels to Texas to confront the person she shot.

The BAU team goes to Colorado to investigate when a passenger jet crashes; the incident reminds Kate of a family tragedy.

A body is found covered in scratches, leading the BAU to believe that the person responsible has a chronic skin disorder.

A child reappears one year after he went missing -- but the team must work quickly when a trick-or-treater disappears under similar circumstances.

The team has a difficult time finding a common denominator among several male victims in Montana; J.J. struggles with feelings about her sister's death.

The team believes a suspect is taking on the persona of an Internet urban legend when people with substantial social media followings are found dead; Savannah and Morgan try to find time for each other.

As the team investigates the disappearance of a prominent Boston attorney, secrets of the man's past are revealed.

The BAU tracks a conflicted killer in Virginia who feels remorseful after committing crimes; Rossi receives a visitor.

When the BAU heads to Salt Lake City to look into a triple homicide, their investigation may lead to a fugitive.

The investigation into frozen bodies found floating in a body of water in Nevada leads the team to believe the victims were members of a cult; J.J. confronts her trauma over her abduction.

The team searches for a killer who calls the authorities before committing his crimes; as Rossi prepares for a visit with his daughter, he gets news about the death of an old friend.

A gas man is engulfed in invisible flames and dies during a qualifying race at the Grand Prix Americas.

Horatio must find his brother's killer and protect a niece he never knew existed; the team explores voyeuristic Internet sites in connection with a stockbroker's murder.

A woman found eaten by a shark turns out to have been bait for a private investigator hired by wives to catch their unfaithful husbands.

Horatio investigates the murder of a thrill seeker who was abducted during the course of an extreme kind of role-playing game.

Horatio investigates the apparent suicide of an anesthesiologist and finds a link to a patient who died during routine plastic surgery.

A mentally impaired man is the only witness to the murder of a diamond broker gunned down in a parking garage; a body disappears on the way to the medical examiner's laboratory.

Horatio suspects revenge is behind the murder of a man who tortured Cuban refugees.

A controlled fire in the Everglades reveals the body of a slain hunter, then a wall of fire overtakes Alexx and Delko at the crime scene, forcing them to take refuge under a tarpaulin.

Horatio infers that a slain photographer accidentally witnessed a murder while snapping pictures of a famous actor.

A former surf champion is murdered in his home, while his wife and son are left beaten and bound.

Robbers steal $2.3 million from an armored truck in downtown Miami, but the loot turns out to be counterfeit, and the team must figure out what happened to the bank's money before it was replaced with fake bills.

The detectives' case hinges on the testimony of a forensic-evidence collector who stole a latex glove from the crime scene; co-workers become prime suspects in a waitress's death.

When the team investigates the death of a dancer who was about to audition for a dance competition show, Booth and Brennan go undercover as contestants.

The team investigates the death of an archaeologist who had just made an important discovery.

When Angela and Hodgins wake to find a corpse in their bedroom, they believe Pelant is behind it; against Booth's wishes, Angela and Hodgins start their own investigation.

The team investigates when two bodies are found at the same burial plot; Brennan and Booth discuss after-death arrangements; Daisy returns for the first time since the breakup.

When a female roller derby skater is killed and dismembered, Angie goes undercover to help solve the case; Cam tries to learn more about Booth's secretive hospital appointments.

While in the hospital after being shot at the lab, Brennan struggles with visions of her mother that defy her usual logic; evidence may link Brennan's attacker to the Jeffersonian.

As the team investigates the death of a seemingly innocent 15-year-old boy, they learn that he was involved in illegal activity.

When a well-educated but eccentric intern starts working at the Jeffersonian, Brennan tries to be more open-minded about scientific questions.

The team investigates the death of a young man whose remains were found at a hazardous waste disposal facility; Cam and Arastoo struggle to keep their relationship secret; Brennan and Booth try to decide where to take their vacation.

The investigation into the death of a former Marine leads the team to a group obsessed with preparing for the apocalypse; Sweets finds an apartment.

The team investigates when an undercover cop turns up dead with a bag of diamonds inside his body; Brennan struggles to be likable as the subject of a documentary film.

The team investigates when a TV producer is murdered; Christine is accused of biting a classmate; Hodgins uses his tools at the Jeffersonian to chemically re-create Finn's hot sauce.

When a patient dies after a hit-and-run accident, Toby discovers that the man was convicted of embezzling millions of dollars.

Toby helps a woman regain her memory and draws the attention of the Integrated Investigative Bureau.

McCluskey recruits Toby on a case involving smuggled weapons.

Toby investigates an assassination threat against a Conservative leadership frontrunner.

Soon after the BAU steps in to help local law enforcement isolate a suspect for a murder, a second person who is related to the first victim is killed under similar circumstances; Prentiss is concerned about Garcia's behavior.

The BAU investigates a spooky local ghost story of the "Tall Man" and the clues it provides when two people go missing in the woods; a third person mysteriously surfaces the following day with limited details as to what happened to her friends.

The BAU investigates four murders along the eastern seaboard; the crimes become personal for Alvez when the team discovers there are ties to his time spent in pursuit of a notorious hit man; Alvez and his girlfriend decide to move in together.

The BAU races to capture the vigilantes behind a series of attacks taking place every 27 minutes in the nation's capital; Prentiss and Unit Chief Andrew Mendoza lead the effort to identify the vigilantes and what's motivating them.

The BAU investigates a double homicide and kidnapping in New Hampshire; Rossi's plans to elevate his relationship with Krystall don't go as planned.

A professor from Lewis' past tips off the BAU to an alarming number of overdose deaths of patients who just completed rehab.

Prentiss faces her past when the BAU is sent to investigate the murders of prominent businessmen, all of whom are missing their hearts; Prentiss plans a romantic first date with Mendoza, but the evening is cut short by an urgent call from Rossi.

The BAU team heads to Portland, Ore., to investigate a chilling abduction that may be linked to a local couple who were killed in their home a week earlier.

The BAU team flies to Iowa to investigate the disappearance of three 10-year-old children who appear to have been abducted from their homes, with surveillance video from a park as their only lead to finding the children's whereabouts.

Rossi questions his actions in the aftermath of a struggle with a serial killer who appears to have outsmarted the BAU.

The BAU investigates a string of murders taking place in supposedly haunted houses in Lewiston, Maine.

Rossi prepares to marry Krystall; the team investigates a series of fatal shootings following car accidents.

The BAU team investigates an unsub with striking similarities to Rossi's latest obsession, "The Chameleon."

The team searches for Everett Lynch and his daughter; Spencer has a meaningful visit with his mother.

The BAU team investigates a series of seemingly random fatal explosions throughout Kentucky and Tennessee.

The members of the BAU enjoy a Saturday off in vastly different ways; Rossi and Prentiss help Simmons assemble a new crib; Garcia leads a hacking competition; Dr. Reid strikes up a conversation with a woman named Maxine.

Following a series of fatal shootings, the BAU team travels to Illinois to investigate what appears to be a copycat serial killer.

After a father and daughter get kidnapped, a former foe of the BAU returns with very specific demands for Dr. Reid.

When the BAU team travels to Denver to investigate several murders, Prentiss is forced to evaluate her relationship with Special Agent Andrew Mendoza.

Prentiss and J.J. are faced with important decisions to make about their futures as the BAU travels to Texas to investigate a series of murdered businessmen.

When the team intercepts a terror group's message for Murdoc, instructing him to kill a tech analyst, Mac poses as a psychopath to save the intended victim.

Murdoc moves ahead with his plans for revenge against MacGyver by recruiting his recently released former cellmate to infiltrate the Phoenix Complex and kill every agent inside.

MacGyver uses a cell phone and soccer ball in the search for a Navy SEAL who is believed to be held captive in the Middle East.

Riley disappears during her first solo mission; Mac and the team attempt to locate her.

MacGyver and the team must steal diamonds before terrorists beat them to it and trade the jewels for a weapon of mass destruction.

When Murdoc drugs and kidnaps MacGyver, Mac must escape and join the team to save Murdoc's next victim.

The team's Halloween plans are interrupted when the vice president's son's plane goes down with a mysterious prisoner on board.

Mac and the team attempt to extinguish a massive oil wellhead fire set by a rebel group in Nigeria.

A brilliant and career-driven surgeon is found dead in a rough neighborhood; a new friend helps Brennan make a discovery about herself.

A body is found in the shower of a home belonging to a young socialite; Hodgins and Angela talk about their future; Booth talks to Hannah about Brennan's feeling for him.

The Jeffersonian team investigates when a notorious murderer known as "The Gravedigger" (Deirdre Lovejoy) is killed by a sniper.

A man's corpse disguised as a scarecrow is found in a cornfield; Booth and Brennan question the victim's three wives, who are also sisters; Cam doubts her relationship.

The team analyzes a BMX rider's remains, discovered on the roof of a warehouse; Sweets asks Booth for advice; Booth makes a decision about Hannah.

When the liquefied remains of a wedding planner are found in a tanning bed on Valentine's Day, Cam pressures the team to work fast so she can spend the holiday with her boyfriend; Clark helps Hodgins realize the best gifts come from the heart.

Sniper Jacob Broadsky takes out a victim who escaped from the justice system; Booth uses his military training to try to stop Broadsky before he strikes again; Angela's father visits the Jeffersonian.

During a blizzard that causes a citywide blackout, the team must solve a murder case that could be connected to a possible viral outbreak; Sweets starts a touchy conversation about Brennan and Booth's relationship.

Brennan teams up with a forensic podiatrist to match seven pairs of severed feet with bodies that wash ashore after a flood; Cam makes college plans for her daughter behind her back.

A TV-show host's remains are found in the wilderness; Vincent Nigel-Murray makes surprising confessions while making amends with each member of the team.

The remains of a maritime museum security guard are found in the Florida Everglades after an attempt to steal a 17th century nautical chart to find treasures; Booth asks a former Iraqi soldier for help with the case.

The remains of a successful ad man are found in a new community center playground; the members of the team try to communicate more honestly.

An unidentified 15-year-old girl, who is hearing impaired and not able to communicate, is found covered in blood and wielding a knife; Angela hides the details of her pregnancy.

Booth becomes more determined to catch Jacob Broadsky after he takes out another victim.

Booth and Brennan go under cover to find out what happened to a man whose remains were found lodged in the pinsetter at a bowling lane.

A woman's remains are found in a paintball field; Booth and Brennan adjust to life as an expectant couple.

An erratic whistleblower who calls Pride her mentor kidnaps him to help her locate a serial killer targeting young women in the Gulf of Mexico.

The team joins forces with FBI Director Isler after a Russian operative with intelligence on sleeper agents disappears; Tammy partners with former sleeper agent Eva Azarova to assist in the disappearance.

The team investigates the copycat murder of an unsolved case from 150 years ago that spawned a legendary ghost story; Gregorio is spooked when the case is connected to a recent séance and a local medium.

Sebastian is placed on administrative leave after being questioned by the FBI about a foot chase; Pride and the team attempt to clear Sebastian's name.

The murder of a petty officer leads the team to a woman who is targeting men with high security clearance; Lasalle's father arrives to discuss the family business.

The team investigates after a clinical trial in which brain implants are put into veterans is hacked; Patton must work alongside his ex-wife, who spearheads the project.

Wade's son asks Pride for help after being attacked and discovering his girlfriend is missing; Pride must meet with a therapist to discuss his process for solving cases.

Pride starts to doubt evidence suggesting homeless kids murdered a petty officer.

Jerry accompanies Junior as he escorts a fallen soldier home to Oahu; McGarrett and Danny discover a body when they delve into the highly profitable black market for sand.

On Halloween, Jerry and his friends search his childhood camp for evidence to a murder he witnessed as a boy; McGarrett investigates a little girl who drew pictures depicting the scene of a recent murder before it was discovered.

McGarrett crosses the line and is arrested while investigating the death of his former SEAL buddy who died while making an emergency landing on an aircraft carrier; Adam returns to Oahu with devastating news about his marriage.

McGarrett investigates a cold case that his grandfather and the famous Honolulu detective Chang Apana worked on in the 1940s; McGarrett and Danny get ready for the opening of their restaurant.

Grover's parents and brother arrive in Oahu for Thanksgiving; a thief is crushed to death by an empty safe.

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.

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.

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.

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.

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.

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.

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.

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.

At Halloween, the team takes on a case to prove the existence of ghosts on the Queen Mary but find a ship on a deadly collision course; Walter considers taking note of Paige's interests to benefit their relationship.

A device that can prevent a nuclear meltdown is tracked through the Los Angeles sewers; Walter learns to listen and not offer advice to Paige; the team meets their new neighbor.

Team Scorpion visits a renaissance festival, but the revelry is cut short when a group tries to rob a nearby police evidence locker; Paige grows weary of Walter pointing out the historical inaccuracies at the festival.

Team Scorpion becomes stranded on a floating island of trash they were trying to destroy; Toby works with Cabe to uncover the details of his father's death.

A petty officer is murdered during Mardi Gras festivities; Pride contemplates what to tell his daughter about his strained relationship with his father.

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.

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

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.

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.

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

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.

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.

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

Pride and the team must go on a dangerous undercover mission to retrieve a stolen missile and prevent an attack.

A blogger dedicated to exposing government corruption is murdered; during the investigation, it is revealed that a war crime may have occurred during a humanitarian effort in Bolivia.

When a highly regarded Navy pilot is killed after crashing a new, high-tech jet at an air show, the team must determine if it was human or mechanical error.