Hawaii Five-0 (2010 TV series) season 5

Five-0 investigate the deaths of two tourists who were hiking on the mountains, and find that the culprit is an unmanned aerial vehicle fitted with automatic weapons. The drone was stolen from a military contractor. As the drone attacks a beach crowd, the streets of Honolulu are evacuated in anticipation of further attacks, with Jerry Ortega (Jorge Garcia) has a plan to hack into the drone. In the meantime, Danny Williams (Scott Caan) and Steve McGarrett (Alex O'Loughlin) attend a mandatory psychological evaluation. Adam Noshimuri (Ian Anthony Dale) proposes to Kono (Grace Park). Jerry suspects a vintage bookshop owner of counterfeiting money, and the owner tells a partner that they have to deal with Jerry. Danny learns from Marco Reyes (Anthony Ruivivar) that his brother Matt has been captured, and Danny has to pay back the money Matt had stolen from his captors.

Note: This is the first episode to feature Jorge Garcia as a main cast member

When Sophie Larkin is kidnapped during her school recital, Five-0 initially suspect that it involves her Navy SEAL father who is on a secret mission in Afghanistan. After the Navy assures the team that there are no security breaches, they realize the kidnapper took the wrong girl when Eric Porter (William Mapother), a father of another girl from the school receives a call demanding $1.6 million. Meanwhile, Marco Reyes reveals to Danny that Matt stole $18.5 million from him. Reyes wants Danny to bring back the money believing he has it.

Three young surfer women (Allie Gonino, Sonya Balmores and Sumire) rob a tour bus, and end up killing a tourist, businessman Nathan Wagner. Evidence suggests that Wagner was targeted, and Kono goes undercover as a surfer. It later surfaces that a conwoman who was after Wagner's wealth is after the surfer thieves as well. Meanwhile, Jerry is investigating antique book seller Thomas Farrow (Greg Ellis), suspecting him of running a counterfeiting ring. Although Farrow was cleared by the authorities, Jerry enlists the help of Kamekona (Taylor Wily). Also, Danny finds the money Marco Reyes was after in a remote area.

Joseph Stegner, hitman working for the Bagosa crime family arrives in Hawaii from Detroit. Five-0 quickly apprehend Stegner, but he is killed by a sniper. The team learn that the suspect is Nick Mercer (Timothy V. Murphy), another hitman under Bagosa's employ. Mercer claims that after he had his heart replaced, he had a change of perspective and decided to run his own Witness Protection Program, by helping Bagosa targets into hiding in a camp in Molokaʻi rather than kill them. Mob boss Albert Bagosa (Carmen Argenziano) has ultimately learned of Mercer's betrayal and is flying to the island with five more hitmen to finish the job. Meanwhile, Danny finds out he is $5.5 million short. At the risk of his career, Chin Ho Kelly (Daniel Dae Kim) gets the rest of the money from his father's killer and former brother-in-law Gabriel Waincroft (Christopher Sean). Danny and McGarrett deliver the money to Reyes only to discover that Matt was dead the entire time. In response, a grief-stricken Danny kills the henchmen before killing Reyes.

McGarrett visits his father's grave on the anniversary of his death, and encounters Ellie Clayton (Mirrah Foulkes), a state prosecutor who also visited his grave. McGarrett learns that Ellie was the daughter of Paul Clayton, who was killed 20 years ago in a supposed robbery gone wrong. John investigated the case which is still unsolved, and the two became close until John's death. McGarrett decides to reopen the case. Jerry continues to investigate Thomas Farrow despite multiple warnings from both McGarrett and Chin.

Note:Danny is absent in this episode as he has brought his brother's body home from Colombia.

Danny returns from his brother's funeral and it is revealed that Matt was dead before Marco arrived on Oahu in Aʻohe Kahi e Peʻe Ai. Chin, Grover, and Kono, investigate a murder victim who was found in a freezer on Halloween night. When a second body is found in a similar fashion, Max (Masi Oka) discovers that the killer is copying the events of Jack Knife, a 1984 horror film in which the killer was killing the students who bullied him. Meanwhile, Farrow interrogates Jerry, and then lets him go. Danny and McGarrett start believing Jerry's claim, but Farrow uses steps to avoid arrest by cleaning Jerry's basement and his home. Jerry discovers that Farrow is an alias of a British Special Forces operative, named William Corrigan, who was dishonorably discharged for attacking a suspected rebel village against orders. Farrow was counterfeiting money to aid the I.R.A.

When McGarrett goes missing, the rest of Five-0 begins searching for him. With the help of Sang Min (Will Yun Lee), the team learns that Wo Fat (Mark Dacascos) kidnapped him. Wo Fat tortures McGarrett for the whereabouts of his father. Wo Fat drugs Steve, causing the latter to believe he's back in September 2010 where Victor Hesse (James Marsters) is arrested before he can kill Steve's father, John (William Sadler). The team also lead different lives where, as a result of Five-0 never existing, Kono is a world champion surfer, Chin was never investigated by Internal Affairs, Max is an ER doctor, Kamekona never goes legit and ends up in prison, Grover is a tourist, Jerry is a mentally ill vagrant, Danny is still happily married to Rachel and embraced the move to Hawaii, and Jenna Kaye is looking for her boyfriend who was in a motorcycle accident. Back in reality, McGarrett learns that Doris took in and raised Wo Fat for years after his mother's death until she was forced to let him go and Wo Fat considers Steve a brother. McGarrett breaks free and a final showdown with Wo Fat erupts between the two, ending with McGarrett shooting him in the head, killing him.

Five-0 investigates the murder of David and Kate Kealoha. David was an investor who was about to be arrested for embezzling from his clients. The team suspect both his sons Jake (Nathan Kress) and Travis (Charlie Carver) to be behind the murder when their pet dog reacts violently to their presence. Travis flees, where Chin and Kono follow him to a motel. It is revealed that both sons were not involved, and Travis was covering up a relationship with his best friend's mother Patti Gabel (Josie Davis). Meanwhile, McGarrett's aunt Deb (Carol Burnett) returns to Hawaii to marry her fiancé, Leonard Cassano (Frankie Valli), who is terminally ill with cancer. Jerry discovers that Leonard was a lawyer who represented a New York City mafia family and was suspected to have destroyed evidence that would convict his client. Leonard later confronts McGarrett to explain to him that he never destroyed the evidence, but secretly kept it. He hands it to McGarrett, who decides to wait "a couple of months" before handing it to the New York District Attorney's office.

Rodeo bull rider Keone Maka is found poisoned in a desert on the Big Island, which NASA uses to test Mars rovers. Max reluctantly joins forces with Dr. Sanjeet Dhawan (Ravi Patel), the Hawaii Island Medical Examiner, with whom he has been feuding for several years. Meanwhile, Officer Pua attempts to bring Steve and Danny to justice for cutting down a Christmas tree on a protected forest reserve. Pua eventually catches Danny with the Christmas tree and fines him $1200, but decides not to take away the tree until after Christmas.

Five-0 investigate the murder of Brooke Waiakea, a hula dancer, later discovering that the dance studio is a front for an escort agency. The victim reminds Dr. Shaw (Amanda Setton), Max's intern, of a past case. The team turn to the aid of Harry Brown (William Forsythe), a former HPD detective-turned-private investigator, who was helping Brooke take down the escort agency.

Bryan Wallace (Gerald Downey), a recently out-of-work consultant, sends his family on vacation from Michigan, but is sent to the hospital after being shot. The shooter is revealed to be Lukas Janssen (Henri Lubatti), an elusive art thief who stole a Vincent van Gogh painting and planted it in Bryan's luggage to avoid suspicion. The investigation is assisted by Nicole Booth (Rebecca Mader), an art thief who steals stolen art for money. She also happens to be an outlaw, with a criminal record and series of arrest warrants issued on her already, which comes to Steve's knowledge by Jerry's secret investigation.

Neurosurgeon Christine Dupont (Sarah Jane Morris) is killed. Five-0 investigate and soon realize that it has nothing to do with Delano, after they find one of her former patients dead. The patient was an employee at a local reformatory where four young boys disappeared in 1974. Meanwhile, McGarrett's father's car is stolen and later found in a disassembled state. McGarrett finds the thief, homeless young man Nahele Huikala (Kekoa Kekumano). McGarrett becomes sympathetic of Nahele and decides to help him. Grover's daughter, Samantha (Paige Hurd) continues to have nightmares of her kidnapping.

Joe White (Terry O'Quinn), now a private security contractor, reunites with McGarrett and aids in the transfer of Mitch Lang, who has contracted a new deadly strain of bird flu in the Philippines. However, during the transfer, Lang is hijacked by terrorists. Five-0 believe that it was linked to a hacking on Homeland Security's database, and the terrorists intend to weaponize the new strain by implanted it on bees, which would spread the virus worldwide. In the meantime, Joe confides in McGarrett that his mother is off the grid and promises to find her together. Regardless, McGarrett has Danny spy on him.

JC Dekker (Xzibit) is shot while attempting to break into prison, but he does not remember anything for the three days leading up to that event. The team learn that Dekker is a confidential informant for Immigration and Custome Enforcement to bring down Roman Zednik, an infamous Bulgarian criminal no law enforcement has ever seen in person. Meanwhile, Kono gets into an argument with Adam over the fact that she still hasn’t accepted his proposal.

Journalist Julius Brennan (A. J. Buckley) is murdered during Chinese New Year. Brennan was covering a genocide in the Congo perpetrated by warlord Roko Makoni (Barkhad Abdi), who was believed to have been killed in an air strike. Elsewhere, Danny learns that his daughter Grace might have a potential boyfriend, when her texts are accidentally forwarded to his phone.

Five-0 work together with California-based Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) agent Kathy Millwood (Melina Kanakaredes) to investigate a series of arson attacks against couples. McGarrett learns that Millwood was not authorized to run the investigation, and that similar arson attacks were committed in California, with one killing Millwood's husband. Meanwhile, Danny takes his girlfriend Amber Vitale (Lili Simmons) on a romantic getaway, but it is cut short when Amber is tracked down by her abusive ex-husband Frank Simpson (David Hoflin) after she left him in New York. Danny is stabbed as he tackles Frank. Elsewhere, Grover and McGarrett practice for a charity golf tournament, and Michelle Wie ends up offering McGarrett some helpful advice.

A couple robs a jewelry store and steal $3 million worth of diamonds. The woman, Emma Mills (Jessica Lowndes) shoots her male accomplice Jacob Anders (Zoltán Hayth) and leaves him for dead, but his body has not been found. Believing Anders intends to get revenge on Mills, Danny and McGarrett stake out her apartment to wait for him. Meanwhile, Danny and McGarrett go on another round of therapy and are told to be more caring to each other.

U.S. Marshals arrest Danny for Marco Reyes' murder, while IA arrests Chin for conspiracy to commit Reyes' murder. Joe reveals to the rest of the team that Reyes was a CIA asset and they want Danny to pay for his death. Danny signs the extradition form to be transported to a Colombian prison when Marshal Sam Alexander (Raphael Sbarge) implies his family will be in danger if he does not. McGarrett later learns that the CIA was getting close to making a deal with Reyes to get access to $1.3 billion of cocaine in his possession and with Reyes dead, the location of the drugs is unknown. McGarrett offers to find the cocaine for Alexander. McGarrett later realizes that his mother was Joe's source, and that she is the reason McGarrett was not arrested for his involvement too. Meanwhile, Chin realizes that Gabriel Waincroft has tipped off IA about Chin's involvement in exchange for transfer to a minimum security prison. However, Gabriel uses this as an opportunity to murder IA detective Rex Coughlin (Robert Knepper) and escape. Now with no case against him, Chin is released. He later gets a call from Gabriel, who merely tells him "you're welcome".

As McGarrett spends the morning getting a shave from a barber acquaintance Odell Martin (Michael Imperioli), a wounded young man, Eran (Steven Krueger), stumbles in, claiming to be fleeing from an Armenian gang led by the ruthless Garig Dobrian (Mark Ivanir) after witnessing a murder. Moments later, the same gang arrives and surrounds the shop. McGarrett, Eran and Odell barricade themselves inside to wait for help. Meanwhile, Jerry is falsely accused of a series of home invasions. As Max provides an alibi for Jerry's whereabouts, Chin and Grover investigate the home invasion and learning the thief is targeting divorced women.

Grover's oldest and closest friend Clay Maxwell (Mykelti Williamson) and his wife Diane (Kim Wayans) vacation in Hawaii, but one morning, Clay calls Grover to tell him that Diane fell off a cliff to her death. Grover's instinct tells him that Clay pushed her. The rest of Five-0 are skeptical however, and Max has rules Diane's death as accidental as there is no evidence suggest otherwise. However Grover promises to find evidence that shows Clay is guilty. Meanwhile, Danny and Shaw are trapped in an elevator with the dead body of Glenn Hurd, where Danny reveals he has claustrophobia.

Jerry and Max attend an Elvis impersonation convention when during a performance one of the Elvises, Lane Collins, collapses and dies. Max determines the death as cyanide poisoning. Five-0 discover that he was poisoned by crazed fan Jane Miller (Calico Cooper). After the case is closed, gunmen break into the ME's office and steal Collins' body. This then relates back to the episode where the jewels were stolen and never recovered. Meanwhile, Gabriel stalks Chin and asks him to smuggle him out of Hawaii. When Chin returns to his home, he finds Gabriel left behind pictures of Adam Noshimuri.

Three middle-aged men on vacation, Nolan Fremont (Jaleel White), Jake Lockhard (Pauly Shore), and Micky Dickson (Kevin Farley), wake up hungover to find a dead woman in their hotel bathtub. When they are arrested trying to bury the body, McGarrett, Danny, and Grover find the men cannot remember the previous night, so they retrace their steps, eventually identifying the victim as Rebecca Oleana, a nightclub waitress. Meanwhile, while Jerry delivers for Kamekona, he witnesses a woman kidnapped in broad daylight. When the car is later found with the kidnapper dead, Chin and Kono work the case and find that the "kidnapper" was the woman's accomplice, the woman is Natalie Morris, who is wanted by the FBI.

Kono sets sail on an outrigger canoe to circumnavigate the islands, only for a severe storm to pass and leaving her stranded at sea. She is forced rely on survival skills taught to her by her mother Nani (Catherine Haena Kim). The rest of Five-0 investigate a series of pharmacy robberies where hoards of drugs which can be used to produce methamphetamine is stolen. The suspect claims he is forced to keep making the drug as his son’s life is threatened.

As they prepare for Kono's wedding, Five-0 investigates the murder of a bounty hunter who was pulled over by an HPD officer. A man was in the trunk and injured the police officer, that had pulled the hunter over, killed the bounty hunter, and escaped in the car. It later turns out that the man killed a young girl in New York and her father pays a different bounty hunter to capture and turn over the man. Five-0 must find the father before more people die. Later, Danny meets his ex-wife Rachel who has a secret to confess to him Charlie is his son, who has a serious illness. Also, Chin is concerned that Adam might have returned to his old ways.

In North Dakota, a weapon convoy is hijacked by an unknown group. The man leading the group, hijacks a plane and forces the pilot to fly to Hawaii. Traces of radioactivity is later found on the plane. As the team prepares for Kono's wedding to Adam, a nuclear bomb is spotted in Waikiki. The team are afraid that it will blow up the city and maybe the rest of Hawaii, so Danny and Steve take it using Kamekona's helicopter and drops it into the ocean. McGarrett, meanwhile, deals with his own issues as Catherine returns from Afghanistan. At the wedding, Chin forgets the wedding rings and goes to his car to get them where he is faced by Gabriel Waincroft. Chin tells him that he should shoot him while he has the chance. Some seconds later, Gabriel has mysteriously vanished, leaving Chin confused.