A team of drug dealers kidnaps a busload of school children in order to get Five-0 to return the drugs they confiscated, while Joe White goes on a personal mission to uncover the identity of "Shelbourne" before Wo Fat does.

As the gang gets ready for Chin Ho's wedding, Five-0 discovers that a man shot in a military bunker was in Hawaii to search for his missing son, and Steve begins to suspect that Joe is hiding secrets about the investigation from him.

While Five-0 tries to figure out who smothered a high school girl in her bed, the Yakuza targets Joe because they believe he killed their leader.

Five-0 investigates the hijacking of a delivery truck in which the driver is killed, Danny's ex-wife goes into labor, and both Steve and the Yakuza put pressure on Joe to give answers.

Just as McGarrett finally gets his hands on his arch nemesis Wo Fat in a special ops raid, he's blindsided when he finds that the Japanese Yakuza is hot on their trail and wants them both dead.

McGarrett brings his mother back to the island. But her life may be in danger after Wo Fat escapes from prison with the help of an unlikely partner: Frank Delano.

McGarrett and a young girl are held hostage by a diamond thief during a campout, and Kono's boyfriend, Adam, welcomes his brother back from prison and gives him an offer to become a legitimate businessman.

Chin Ho is drugged, kidnapped, and placed in a maximum security prison as retaliation for Frank Delano's death, but will he be able to make it out alive?

McGarrett helps Doris on a dangerous mission to retrieve stolen microfilm, and Kono is shot while investigating a lead about Yakuza secret burial site that may be connected to her boyfriend.

While Five-0 searches for an escaped federal prisoner connected to a terrorist plot, Kono tries to clear her name after her gun is used in a murder.

Before McGarrett can get answers about his mother from Wo Fat, terrorists break into the prison and also take hostages at Five-0 headquarters.

A hard-as-nails Texas Ranger arrives on the island to look for his missing daughter, Kono and Adam's secure location is compromised, and an old friend comes to Catherine with a job offer.

As Five-0 deals with the murder of an ex-con wedding crasher, McGarrett and Danny are forced to deal with problems in their relationships.

McGarrett tries to find the man who killed his old SEAL friend Billy while he and Catherine were working a surveillance job, and he also turns to Joe White to track down his mother.

When Captain Grover's friend disappears, Five-0 discovers that his friend was hiding a dangerous secret. Meanwhile, Danny befriends a New Yorker new to the island, and Kono reunites with Adam.

Five-0 must find out who has hijacked a drone and used it to attack civilians and why.

Wo Fat kidnaps McGarrett to get answers about his father. He drugs McGarrett during his interrogation, which causes him to have hallucinations that his father is still alive.

Kono must fight for her life after discovering a notorious criminals identity; Adam's ties to his formerly corrupt family business leaves Kono feeling concerned.

While Five-0 searches the island for a stolen nuclear warhead, Catherine returns to the island just in time to attend Kono and Adam's wedding.

A murder mystery sends Five-0 in search of pirate treasure. Meanwhile, Gabriel Waincroft holds Kono and Adam hostage after their wedding and demands the money they were using to pay off the Yakuza.

Five-0 needs the help of an imprisoned bomber to find a copycat on the loose, but is he somehow related to the crime? Meanwhile, Kono and Adam discover that they're being watched after Adam recovers from the shooting.

Five-0 investigates when a wealthy recluse is found dead in a remote field with nearly one million dollars in counterfeit bills. Also, Adam is kidnapped by the Yakuza and forced to torture one of Gabriel's men. Jerry Rice guest stars.

Five-0 works with a conman to find a killer after his partner is murdered. A San Francisco police inspector helps Chin Ho investigate the murder of Chinese arms dealers. Adam receives some unsettling news after meeting with the Yakuza boss.

The brother of a local boxer is killed the night before his championship bout, and Five-0 connects it to Gabriel Waincroft, who has an even bigger target in mind. Meanwhile, Adam takes a plea and prepares to serve his sentence.

Chin Ho asks Kamekona to go undercover to help solve the murder of a former drug-dealing associate from his past, while Steve and Danny go to a couples retreat to work on their relationship..

Five-0 goes on a manhunt when a chemical spill permits six dangerous inmates to escape, including Kono's husband, Adam.

When a cache of guns is stolen from a gun range, Five-0 discovers the culprit is intent on making a dramatic and potentially deadly statement on gun violence. Also, Kono and Adam are finally reunited when he is released from prison.

On Halloween, Five-0 investigates the murder of a medium with a checkered past who was apparently scared to death by a poltergeist. Also, Kono and Adam are kidnapped by what appears to be a death cult.

The team handles the fallout in Mexico after Chins problems, back on the Island Grover goes undercover.

McGarrett works the murder case one of the last survivors of the USS Arizona. Adam uncovers bone fragments at his new construction job.

When McGarrett gets a tip that someone is plotting a terrorist attack on Oahu, Five-O searches for those behind it before it's too late. Also, Chin and Abby have a very difficult decision to make.

McGarrett puts his life in lethal danger when Five-O puts a risky plan to rescue a group of young girls from a sex trafficking ring in motion, Kono decides to make a life- altering choice because of the unique strain caused by the case.

McGarrett and Adam join Junior at a bank heist in progress, forcing all of them to make difficult decisions in how to proceed into the bank and after the suspects. Tani has issues with a family member and gets advice from Lou.

McGarrett poses as a pilot to investigate the cause of a plane crash that led to the death of a pilot in an air race.

When investigating a deserted yacht adrift at sea, McGarrett, Danny, Tani and Junior are exposed to a deadly bioweapon and the rest of Five-0 have only eight hours to find an antidote.

When Danny is shot while quarantined in the hospital with McGarrett, Tani and Junior, he's left unconscious and clinging to life, imagining a future for everyone in Five-0.

Danny, still recovering from his gun shot wound is telling his son Charlie a bed time story who Steve and a group of veterans are hunting down some fake Santas who robbed a money truck.

McGarrett rounds up every gang-related criminal on the island to find the culprit behind the killing of an FBI agent who was cracking down on organized crime.

When a man accused of killing his wife threatens to kill himself, Grover reveals how he was once on the brink of suicide himself.

When a corpse is stolen from the cemetery, the team races to find out who the man was and why he was taken; Adam recruits someone to become an informant; Tani receives devastating news.

He Puko'a Kanu 'Aina- McGarret and Danny investigate the murder of a private detective whose client was killed the same way.

Five 0 investigate the murder of the headmaster of a private school sending Tani and Junior undercover as prospective parents. Meanwhile Adam is forced to produce a huge amount of hidden money to save his life.

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

A flashback about the case that changed Danny's life and an answer about who shot him by meeting a woman who was married to the shooter. Jimmy Buffett returns, Alex O'Loughlin directs his first episode and plays the guitar.

A hitman, Leroy Davis (Frankie Faison), McGarrett's father failed to arrest comes to McGarrett to finally confess his crimes and admit where he buried his victims. Also, Jessie makes a dangerous decision that could ruin Adam's life.

Catherine returns to Oahu, Hawaii, U.S.A. to ask Five-O for some help in order to follow up on a lead for one of her Central Intelligence Agency cases. (#188)

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.

Duke is forced to steal crucial evidence from the police locker in exchange for his kidnapped granddaughter; Jerry goes undercover at a mental health facility to solve a murder. (#190)

Steve and Five-O take on the mob when a former boss is killed; Junior's friend is on the run after witnessing the murder. (#191)

Steve joins Junior and his SEAL team on a mission to capture an elusive person who is holding his mentor hostage; Gerard and Kamekona help Lou and Tani on a murder case involving art stolen by Nazis in World War 2. (#192)

The team discovers a Russian spy ring hiding on Oahu, Hawaii U.S.A. when one of their submarines appears off the coast. (#193)

After Steve's CIA agent friend is killed, McGarrett lets himself be captured by the group he thinks is responsible and endures a torturous sensory deprivation tank to find the killer.

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

The whole island is collapsing under a heat wave. Lots of people running wild and Danny and Steve are chasing a murderer.

SO2 Junior Reigns and Jerry Ortega escort U.S. Air Force SSGT Kaliko Christopher coffin from Dover Delaware to Hawaii. Duke is forced to Retirement. Steve and Danno investigate Illegal Black Market sand.

Young Jerry witnessed a murder while at camp in 1982. He's telling this story to his friends while going back to the camp in the present day. He wants to search for the body before developers level the property. A woman watching a news story about a murder realizes that her daughter drew a picture of the crime scene three days earlier. Jerry's most likely site for the body is on the property line of Bo Bradley, who Jerry thinks is the Axe Man. McGarrett and Junior interview the girl. Katie. She says her friend Molly drew the picture. Noelani shows up to help hunt for the body with ground-penetrating radar. in 1982, Jerry breaks into Bradley's house and ran away screaming after Bradley finds him. Noelani finds a bone, but it's canine. Jerry keeps digging because he thinks there's a body underneath, while everyone else leaves as it starts pouring. Three of Katie's pictures were drawn by someone else. Katie's parents see this girl, Molly, on the monitor but she escapes. Everyone's phones and keys are missing at the camp. Tani finds a woman that may have been attacked by the murderer. McGarrett thinks the drawings may be three different redheads. Jerry found human remains, but he's being followed by someone. Gordie knocks on the door and spooks everyone. He took the keys and phones. He goes to get them, but his throat gets slashed. It's the ax man, who set the cabin on fire. They have to run out, but Bradley shoots the ax-man, who is the kids' old camp counselor. The serial killer is Molly's father, who went nuts when her mother divorced him. Jerry goes back to thank Bradley and apologizes to him. Molly's mother comes to get her. Captain Keo said the gun in Adam's house was the one that killed Noriko.

McGarrett crosses the line and is arrested while investigating the death of his former SEAL buddy, who died on an aircraft carrier, and the only survivor is a baby. Also, Adam returns to Oahu with some devastating news about his marriage.

A cold case of Chang Apana (a real life detective in 1930s Honolulu) lands in Steve's lap. This leads to the crew working on the case in a 1940's world.

Lou has his family visit for Thanksgiving and his longstanding feud with his brother is on once again. A house thief is found dead in a very strange way while in the process of committing the crime.

A renowned urban vigilante is killed after making another citizen's arrest, and Five-0 delves into the world of super heroes and comic books to find the killer. Also, Adam finally gets closer to finding out who killed his sister.

A mission from Steve's past brings what is left of his SEAL team together to protect themselves from the group that wants them dead while Five-O looks for the man who took on McGarrett by himself.

Steve, Catherine, Danny, Junior, & old friends hunt the killer of one of their ohana. Tani & Grover investigate a missing bag of human bones.

McGarrett and the team support Danny & Rachel by determining what happened when Grace gets into a life-threating 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. Also, Grover has an emotional reaction to the case.

While a hurricane lashes Oahu, the Five-0 must house a federal prisoner with a history of escaping. Danny has houseguests during the storm, while an evacuation patrol puts Tani in a dangerous situation.

A woman dies suspiciously while swimming as part of a mermaid troupe, and Adam throws more than a helping hand to a down on his luck drunkard vagrant.

Five-O has to chase down a group of murderous bank robbers after they just shot their way out of the bank.

Tani and Junior go under cover at a gym to track down a deadly batch of steroids; Danny and MacGarrett 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 sisters death.

Five-0 must locate a teen girl who purchased a gun from a junkie, and discover that the firearm, over the course of decades, has affected all of their lives.

Five-0 investigates the murder of a man whose body may hold the key to a 20-year-old case involving a kidnapped girl whose father never stopped looking for her.

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

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

Fugitive hacker Aaron Wright (Joey Lawrence) resurfaces to ask Five-0 for help when his co-workers at the NSA, which he has been working for, are all murdered. Also, Junior speaks at the parole hearing of the drunk driver who killed his sister.

Five-0 continues to hunt down escape 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.

A new ally helps McGarrett and the team when mob bosses on the island are targeted by an assassin; the team says goodbye to one of its own.

Tani and Junior must plot an escape for themselves and several civilians after they become trapped inside a deadly tunnel collapse; Eddie the dog sniffs out a bomb that has been planted in McGarrett's home.

A plane that mysteriously crashed into the Pacific in the '80s is found, but with a recently murdered scuba diver inside; McGarrett and Quinn zero in on who planted the bomb in his garage; McGarrett formally asks Quinn to join the team.

Five-0 enlists imprisoned hacker Aaron Wright to help when a young girl is reported kidnapped.

Five-0 investigates a deadly home invasion after an extremely dangerous prisoner escaped from the basement. Max returns to the island with a guest.

A deadly hit-and-run involves a driverless car carrying heroin; Tani and Quinn are stuck with a pair of YouTubers who are brought on a ride-along.

When the CIA informs McGarrett that his mother has gone rogue on her undercover mission and may have killed her partner, Steve goes solo to Mexico to bring her home and prove her innocence.

Five-O teams up with a DEA agent to search for a killer whose plane crashed in the jungle with $10 million worth of heroin on board. Also, Grover is thrilled when his niece Siobhan comes to try out for the University of Hawaii basketball team.

It's Thanksgiving, and while Junior and Tani track down the thief who robbed his parents' home, Five-O investigates the murder of a beloved philanthropist and the theft of his ultra-valuable koa tree. Also, Danny moves in with McGarret.

When Adam's girlfriend, Tamiko is kidnapped right in front of him, he shuts out Five-O and breaks all the rules in order to get her back. Also, Five-O investigates three seemingly unconnected homicides.

A tourist helicopter is shot down by a missile; a search for stolen artillery leads to a ghost from McGarret's past -- Wo Fat; Adam makes a bold decision about his future.

Five-0 enlists the help of Thomas Magnum to retrieve a stolen list of undercover CIA agents.

Grover and the team investigate a murder at a private golf course involving a man who was frozen to death in the locker room's cryotherapy chamber; McGarrett tags along with Danny to a school meeting.

Soon after Danny meets the girl of his dreams, they get into a potentially fatal car accident in an area far from help. Also, McGarrett enlists Quinn and Tani to help when Eddie the dog suddenly shows signs of PTSD.

When Grover's niece, Siobhan goes missing from the police academy and it's discovered her boyfriend is an undercover member of the Yakuza, Adam may be her only hope of rescue.

On Valentine's Day, Tani and Noelani are held hostage during a convenience store robbery. Also, Five-0 investigates the murder of a Thai diplomat whose wife confesses to the crime, but Danny suspects she's covering for the real killer.

Harry Langford helps Five-0 investigate a series of murders that follow the plot of a fabled unpublished crime novel from the 1920s. Also, Tani and Junior's friendship takes a meaningful new turn.

Dr. Noelani Cunha's uncle dies mysteriously and she sets out to discover what really happened to honor his memory, and arrest his murderer.

Five-0 investigates when a rancher is murdered after he uncovers human skeletons on his property where legend says that Civil War-era gold coins were buried. Also, Quinn's former stepdaughter, Olivia (Siena Agudong), reaches out to her for help after her father doesn't come home.

The team investigates a scheme to rob tourists; Tani helps Girard Hirsh prove the innocence of his elderly uncle when he's suspected of murder; Tani and Junior work on the nuances of being in a new relationship.

Two bank robbers are on the run and take a family hostage. Luckily a good Samaritan saves them, but at the same time crosses a crime boss. Also the mystery surrounding Doris' letter thickens.

Danny is abducted and badly wounded by Wo Fat's wife, who is after the cypher Steve's mother left him. Also, Steve finally solves the case his father left for him 10 years ago.

When Adam's girlfriend, Tamiko is kidnapped right in front of him, he shuts out Five-O and breaks all the rules in order to get her back. Also, Five-O investigates three seemingly unconnected homicides.

He Puko'a Kanu 'Aina- McGarret and Danny investigate the murder of a private detective whose client was killed the same way.

Five 0 investigate the murder of the headmaster of a private school sending Tani and Junior undercover as prospective parents. Meanwhile Adam is forced to produce a huge amount of hidden money to save his life.

When a corpse is stolen from the cemetery, the team races to find out who the man was and why he was taken; Adam recruits someone to become an informant; Tani receives devastating news.

A woman dies suspiciously while swimming as part of a mermaid troupe, and Adam throws more than a helping hand to a down on his luck drunkard vagrant.

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

McGarrett rounds up every gang-related criminal on the island to find the culprit behind the killing of an FBI agent who was cracking down on organized crime.

A hitman, Leroy Davis (Frankie Faison), McGarrett's father failed to arrest comes to McGarrett to finally confess his crimes and admit where he buried his victims. Also, Jessie makes a dangerous decision that could ruin Adam's life.

A tourist helicopter is shot down by a missile; a search for stolen artillery leads to a ghost from McGarret's past -- Wo Fat; Adam makes a bold decision about his future.

When Grover's niece, Siobhan goes missing from the police academy and it's discovered her boyfriend is an undercover member of the Yakuza, Adam may be her only hope of rescue.