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Forced to remain completely immobile, Danny tells Steve about his toughest case when he was a cop in New Jersey while bomb techs try to disarm a bomb he inadvertently triggered.
The team goes after Wo Fat and Delano for the death of an important person. Steve must resolve the issues between him and his "dead" mother, once he finds her alive and well.
McGarrett captures Wo Fat in a special ops raid but he learns that the Yakuza have been trailing them and both of them are marked for death.
As McGarrett and his team close in, criminal mastermind Wo Fat retaliates against Five-0. And without the Governor backing them up, McGarrett's showdown with Wo Fat could mean the end of Five-0.
Danny works to help clear Steve's name with the help of an old friend. Kono is under an internal affairs investigation and is on leave.
A crooked cop who is seeking revenge against Danny decides to visit the island, putting Danny and his family in jeopardy.
Jenna Kaye seeks McGarrett's help in delivering a ransom to North Korea to rescue her fiancé. While investigating the death of a reporter, Five-0 comes across a link to Jenna.
The team searches for a killer after an officer is killed.
Chin is kidnapped and taken to the Halawa Prison, where he is dressed as an inmate. He must find a way out before his identity is revealed.
Five-0 looks for kidnappers after they discover the body of the previous victim from ten years ago. Even though it might harm what she has going with Adam, Kono asks a favor of Catherine.
Hawaii Five-0 needs help when they encounter a terrorist who states that he has a deadly virus and will release if his demands are not met. The NCIS counter terrorism team stationed in Los Angeles sends over two of its agents to assist the HPD.
A camping trip with Grace doesn't turn out as planned when an armed man takes Steve and a little girl hostage. Kono meets Adam's dodgy brother just out of prison.
Steve and Danny take some time off to enjoy a little fishing only to find themselves stranded and facing pirates.
A professional hit on a teenager has Five-0 searching for the reason why in order to determine who killed her.
The team is directed to investigate when a prostitute is murdered in a Congressman's home, who is nowhere to be found. Danny has his own drama as the custody hearing regarding Grace goes to court.
Doris needs Steve's help on a clandestine mission to take back an incriminating microfiche. Kono is in jeopardy whilst getting closer to finding out Adam's secret.
Five-0's latest case involves the only witness in a high-profile murder case who's gone missing. They must find her and keep her safe from those who want her dead.
Five-0 investigate the mysterious death of a radio DJ and uncovers evidence that leads them to Tony Archer, a local PI and retired NYPD bomb expert.
Halloween has Five-0 investigating a ritualistic murder, with evidence the killer will strike again.
When someone tries to kill a Pearl Harbor veteran, Five-0 links evidence to a crime committed within the internment camps on Oahu during World War II.
Steve attempts to arrange a reunion between his mother and sister. When a young computer hacker is murdered Hawaii Five-0 steps in.
When a Judge's daughter is murdered, the team must figure out why, before more killings occurs. Danny's brother Matt is in town but a family reunion is not the reason.
Chin Ho relates some earth shattering news to McGarrett concerning Joe White resulting in a hostile face-to-face. When Rachel goes into early labor Danny's on hand to help out.
A Hawaiian history buff tries to help Five-0 with their investigation of a man dressed as a Hawaiian NaKoa warrior who was found murdered in the jungle.
McGarrett tracks down August March, a former diamond smuggler, to help clear his sister when she's arrested for smuggling conflict diamonds.
The daughter of a murdered Lua master comes to Hawaii Five-0 for help. Steve decides to have a private investigator keep tabs on his mother.
Max reveals some revealing information about his childhood in order to convince Five-0 that a serial killer is on the loose.
Five-0 is assigned by the CIA to find a missing federal prisoner after the plane he is being transported to Oahu on arrives without him, but instead has four dead bodies. After being set up for a murder, Kono finds herself on the outs again with the police force. Steve has another surprising encounter with Wo Fat. Danny reconnects with Gabrielle.moreless
A member of a local roller derby team falls to her death in front of Dog the Bounty Hunter, as he is arresting a fugitive just a few feet away. Catherine is sent in undercover as a new member of the derby team. Steve finds out that Catherine kept a secret from him involving his mother and questions whether he can trust her.moreless
To solve a double murder, Five-0 gets some help from a conspiracy theorist.
When a busload of children go missing, Five-0 must rescue the children and find those responsible.
During the pro-bowl weekend in Hawaii, the team catches a case investigating a murder and finds help from Arian Foster, running back for the Houston Texans.
Steve and Danny stumble upon a homicide case while out searching in the jungle for Hawaiian petroglyphs. While on a visit with Chin Ho to visit their dying aunt, Kono learns what really happened to end Chin Ho's career with the Honolulu police.
Steve goes to Cat for help finding his mother. When an art heist turns deadly, Five-0 turns to August March.
When an Elvis impersonator is killed and his body stolen, Five-0 is on the case after it's discovered the culprits are after the hidden diamonds sewn into the victim’s costume. Gabriel returns asking for Chin's help in getting off the island.
When the actions of Five-0 almost result in an international incident, Lt. Governor Denning announces that one team member will lose their job.
Steve's attention is divided between their current investigation into a Polo players murder and the return of his mother.
The team investgates the kidnapping of a teenager while Kono is being investigated by Internal affairs and a profiler is assigned to the team by the new governor.
As the Five-0 team investigates a young couple killed while filming a documentary, Danny finds himself placed under a curse by a transient at the killing site.
A body discovered in the trunk of a stolen car is hard to identify because of the physical alterations to the victim. Since Danny is without a place to live, he is forced to sleep on Steve's couch.
The team investigate when the body of a real estate agent is found buried at one of his listings. Danny's mother unexpectedly comes to town with some extremely startling news.
The investigation into a plane crash and a dead custom agent leads Five-0 to question if the victim was alive before takeoff. Danny finds himself taking in an abandoned dog.
When a former cyber terrorism expert is kidnapped, Five-0 is assigned to find the missing expert in order to protect national security.
Five-0 is investigating the murder of a volleyball coach which leads to new evidence about one of their own. Chin and his former fiancee Malia find themselves spending time together.
After following up on a tip, Steve and Danny are trapped inside an abandoned building that is rigged to explode.
Five-0 must determine who killed a member of a local company that is bringing sharks in closer to shore. Steve assists Kamekona in getting his helicopter license and this becomes a hot topic of discussion.
A man who was injured years ago begins taking revenge on the police officers who caused his injuries, including Steve whose father was one of the officers responsible for his maiming.
A serial killer at the heart of Five-0's investigation puts Chin's life in danger. While on the shores of Oahu, Danny and Grace come upon an odd puzzle box.
Five-0 helps sober up three married men and sort out the events of their wild night to find who killed the woman found in their hotel suite. Jerry witnesses a woman’s kidnapping off the streets of O'ahu.
Five-0 combs a convention to find the killer of a sci-fi fan who was thrown out of a high-rise window. A CIA agent who's interested in the Yakuza that killed McGarrett's parents shows up in town to meet with Steve.
Five-0 assists a Texas Ranger in finding his missing daughter when they cross paths with him during a murder investigation. Adam and Kono run into problems and find themselves fighting for their lives.
With national security in mind and at the behest of the Governor, McGarrett and Captain Grover set out to serve a warrant on a young computer hacker.
Five-0 investigates three murders that appear related to a downed top-secret Chinese satellite. Captain Grover lets Clara accompany him on a ride-along.
Danny and Chin are arrested for deadly past transgressions. McGarrett enlists Joe's help in the investigation.
While Danny gets assigned to protect a Victoria's Secret model, Max and Sabrina find themselves in danger when a bank robbery goes awry.
Season 5 ends with Five-0 learning that a stolen nuclear bomb is somewhere on the island and is about to be detonated. Meanwhile, McGarrett is stunned when Catherine returns to Hawaii; and Chin confronts Adam about his lingering connections to the Yakuza, on the eve of Adam and Kono's wedding.
Agent Kaye's information has helped Five-0 narrow in on capturing Wo-Fat, but before they can act Danny becomes exposed to a lethal chemical. The investigation into this neurological agent takes precedence as Five-0 must prevent a bio-terrorism threat to the island.
Five-0 must intervene when a NYPD detective goes seeking revenge against a local crime lord.
When a therapist's patient is murdered, Steve finds evidence that the therapist may be involved. Catherine finds herself mixed up in Doris' past, when a former target is looking for payback.
The team must deal with pirates who've taken a pleasure cruise full of spring breakers for ransom, as well as their worried parents.
Five-0 works with a California ATF agent to locate a serial arsonist targeting couples on Oahu. Danny and Amber's romantic getaway is ruined when her abusive ex-husband tracks them down.
A man left for dead in an abandoned bunker leads Five-0 to a case being investigated by Captain Fryer.
Steve and Wo Fat fight to escape from the attack on the maximum security unit. Catherine is taken hostage when Five-0 headquarters is seized. Five-0 goes behind the new SWAT Commander’s back to rescue Catherine. Kono and Adam find themselves exposed while hiding in Hong Kong.
Captain Grover must steal $100 million dollars in order to get back his kidnapped daughter.
The murder of Chin’s father, 15 years ago becomes the focus of Internal Affairs and there are questions regarding Malia’s relationship with Chin and its impact on the prior investigation.
McGarrett is kidnapped by Wo Fat and witnesses what would have happened to the Five-0 team if they had taken a very different path. Five for Fighting performs "All for One" to celebrate show's 100th episode.
A Detroit hit man is murdered by one of his colleagues on the streets of Oahu, and Steve is shocked when he learns the killer's surprising motive. Meanwhile, Chin puts his career on the line to help Danny get the money he needs to save his brother's life.
When an Oahu State University professor is found murder, the team must solve the case. There are three suspects his boss, his teaching assistant or a cheating student.
Steve ends up in a charity MMA fight while investigating the murder of a local restaurant owner. Steve and Joe call NCIS Agent Kensi Blye to review a video of John McGarrett.
Steve and Catherine journey to Afghanistan to help a young boy whose family is responsible for saving Catherine's life many years ago.
Catherine's surveillance job turns deadly. In order to save Kono, Adam reflects on what his best move should be.
Grover's oldest and closest friend tells him that he witnessed his wife fall off a cliff to her death, but Grover suspects it was no accident. Meanwhile, Danny and Dr. Shaw get trapped in an elevator with a dead body that needs to be processed.
When a local deep sea diver is murdered, Five-0 heads out into the ocean to find the killer.
A high-speed police chase leaves the driver dead, but also leads to a shocking discovery. As the team is investigating this case, they find themselves needing to talk with Chin's ex-fiancé.
Steve and Danny work on their relationship when they stake out the apartment of a woman who fled from a diamond robbery.
The team investigates when two sons are the prime suspects in their parents' murder. Aunt Deb shocks McGarrett when she returns for a visit with a new fiancé.
Five-0 search for a serial killer who is copying murders depicted in a cult slasher film. Meanwhile, Jerry is kidnapped by the counterfeiters he has been tracking.
A runaway bride is the main suspect when a wedding crasher is murdered. Danny decides where his relationship with Gabby is headed.
Five-0 investigate the abduction of a girl from her home which also resulted in her father being shot. Danny attempts to get his parents to reconcile and Jerry makes sense of a code he found on the bottom of McGarrett's champ box.
The young daughter of a Navy SEAL, who is currently on a top-secret mission, is kidnapped. Meanwhile, Danny's brother is taken captive, and Danny must locate $18.5 million in order to free him.
McGarrett and Odell come under siege in Odell's barbershop when they try to protect a man who is being hunted by a gang. Meanwhile, Jerry is wrongfully accused of committing a series of home invasions.
Five-0 travels to the Big Island to investigate when a cowboy is poisoned. Where there, Max is forced to work with a rival medical examiner. Meanwhile, McGarrett pressures Danny to steal a Christmas tree.
A neurosurgeon is assassinated just before performing a surgery. The investigation uncovers the truth behind the disappearance of four reform school boys over 40 years ago. Meanwhile, McGarrett's beloved Mercury Marquis is stolen by an unlikely culprit.
Five-0 investigates the murder of a bounty hunter who was killed after he apprehended a fugitive. Meanwhile, Rachel reveals a long-held secret to Danny that has serious ramifications.
Steve reflects back on his last mission in North Korea as he and Catherine recover the remains of fallen soldier.
Captain Grover is aided by McGarrett in his search for a friend who has disappeared, after it seems like he's committed murder. Kono persists in her quest to find Adam.
On the fourth anniversary of his father's death, McGarrett meets a woman who helps him reopen the last unsolved case his dad worked on before he died.
A patient infected with a contagious and lethal strain of bird flu is kidnapped and the culprits intend to weaponize the virus.
An escaped convict out to prove his innocence kidnaps Steve and Danny. Grace punches out another student at school.
Kono fights for her life when she discovers the identity of a notorious criminal who has never been seen. She also confesses to Adam that she is conflicted about their future together due to his ties to his formerly corrupt family business.
Season 5 begins with the island of O'ahu being put on lockdown when Five-0 hunts a terrorist who is using weaponized drones on civilians. Meanwhile, Steve and Danny attend a mandated review with a psychologist that looks like couples therapy.
A renowned photographer has been murdered and Danny thinks this case may be the best one yet when he has to talk with the models in town for a sports magazine's annual swimsuit cover shoot.
When Steve arrests a man who attempted to car jack him, he meets a young boy at the station, who peaks his interest. The boy's father is missing and Steve decides to help him, being concerned that the father may be in real trouble.
Halloween and a shooting have Hawaii Five-0 looking for a man carrying out experiments and turning humans into zombie-like creatures.
The daughter of a macadamia nut tycoon is murdered during Chin's high-school reunion. The investigation reveals that the victim was killed with a stiletto heel.
Five-0 is tasked with babysitting Mary's newly adopted baby, even as they investigate the murder of an undercover ATF agent.
A journalist is killed and Five-0 uses his reporting to track down a presumed dead Congolese warlord who is alive and living on Oahu. Meanwhile, Danny overreacts when Grace's text to a boy start accidentally showing up on his cell phone.
A tourist is shot after unknowingly transporting a stolen Van Gogh painting. Kono and Chen investigate and infiltrate the world of black market priceless art, where they are taken hostage. Meanwhile, McGarrett asks Iron Chef Masaharu Morimoto to train Kamekona to beat Chef Sam Choy in a shrimp cook-off.
Three young women rob a tour bus, but things go horribly wrong when a man is killed and the women unknowingly steal something of great value that puts their lives in danger.
As Five-0 investigate the death of a pool cleaner, they uncover a group of radicalized students who may be plotting a terrorist attack on U.S. soil.
With the President on the way to Oahu, Five-0 is tasked with the murder investigation of a secret service agent. Steve's Aunt Deb comes for a visit along with an eye opening secret.
Kono fights for her life when she encounters rough weather while on a solo catamaran trip around the Hawaiian islands. The journey is something her mother always wanted to do but was never able to experience.
An old-school private detective helps Five-0 investigate the murder of a young woman who was secretly working as an escort.
When a Navy SEAL turns up dead, Joe asks McGarrett to take a second look at his death. Kono is spending time with a group of ex-cops that were rumored to be dirty, much to Chin's disappointment.
Things turn dangerous for a talk show host and her crew following Five-0 around when they run into Wo Fat.