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25 Episodes 2018 - 2019
Episode 1
Fri, Sep 28, 201843 mins
Five-0 investigates the murder of McGarrett's CIA agent and veteran friend Harrison, whose colleague, Steve's ex Greer, asks Five O's help, suggesting there must be a mole within the CIA. After a trusted CIA bigwig confirms a pattern of killing off five other CIA agents in the Pacific, presumably by the Chinese, McGarrett's agrees to a plan to let himself be captured in order to find the mole and MO, only to find out it's none other than Greer. While in a sensory deprivation tank, Steve dreams that Wo Fat is responsible. McGarret decided to bury the cash Kamekona loaned him in a hole he and Junior dig in his backyard, but had to abandon this to wind and canine dispersion. Tani struggles to find the nerve to tell McGarrett about the presumed, unchecked murder weapon to Adam's sister in his house.

Episode 2
Fri, Oct 5, 201841 mins
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.

Episode 3
Fri, Oct 12, 201842 mins
During a heat wave, an arrested woman on transport shoots two Honolulu Police Department (HPD) officers and a motorcyclist in cold blood. Steve and Danny discover it's the alias of the only escaped member of a professional Texan bank robbers gang, who killed her janitor and is after the air-co mechanic after they discover her loot stash, which is also missing, but brigs her no joy. With an increase in 911 calls, Tani and Junior are detached to assist the HPD, but during an arrest a man 'joyrides' their car, just for the air-conditioning. Ever-greedy Kamekona triples prices at his Shaved Ice stand when his competitor suffers a blackout, only to have the stand toppled over and damaged by angry customers. While at the grocery store, Jerry handcuffs an ice robber, only to cave in for his motive. At the golf course, Grover drags his sun-struck caddie Gary along as witness while he beats his best-ever score -at par- as the heat suppresses his knee trouble.

Episode 4
Fri, Oct 19, 201843 mins
Jerry travels with Junior to bring home a fallen soldier whom Junior motivated to join the service, was killed in action. Jerry opens up about how he was rejected from joining the service. Meanwhile, McGarrett and Danny investigate a body that was found in the ocean that might have been sold in the black market.

Episode 5
Fri, Oct 26, 201843 mins
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.

Episode 6
Fri, Nov 2, 201843 mins
McGarrett receives news that his former fellow Navy SEAL team member Carson Rodes was killed landing a private airplane o an aircraft-carrier and is officially the prime suspect in a baby kidnapping case. Duly fearing cocky NCIS agent Emma Warren incompetent to solve the case, McGarrett ignores having no jurisdiction, sneaks his team onto crime scenes and after ignoring warnings for interferes with the investigation ends up arrested, only to be released on governor's order and offers to collaborate. So Five-O can demonstrate how to crack the nuts, from identifying the baby boy as 'loot' in a bloody shootout to the sinister parental issues. Meanwhile, Adam is back in Hawaii, crushed after he and Kono had broken up. Tani hesitates with the decision to turn in Adam because of the gun discovered in his home but later finds out that someone actually trying to set Adam up, and Steve recruits his for F-O.

Episode 7
Fri, Nov 9, 201843 mins
In present day Hawaii, during the soft opening of McGarrett and Danny's restaurant, a retired cop tells McGarrett that he was best friends with and had worked with Steve's eponymous grandfather back in the 1940s. He gives Steve 'Junior' their file for an unsolved 1940s case for him to investigate, the only one the legendary whip-cracking, unarmed first native detective never cracked. While working through the case contents, McGarrett dreams he is his grandfather and the rest of the Five-0 team are all involved in the unsolved disappearing of Leyla, native housemaid of a plantation owner and crime baron, who had a secret affair with his son, who was murdered by the rival gang.

Episode 8
Fri, Nov 16, 201843 mins
Steve concentrates on hosting a last big party for Thanksgiving at the restaurant before selling it off to Mamo Kahike. A robber was fatally crushed while trying to carry a safe downstairs. He must have had an accomplice, and the only stolen object of real value is a rare baseball card. Junior, Adam and Tani trace it to a volunteer at a local homeless shelter who serves their annual festive dinner despite the robbery victim having canceled his donation for fiscal reasons. Lou has trouble hosting his family dinner when his dropout brother Lou and his brother Percy Jr., bossy mother and father Percy Sr. visit for Thanksgiving. The ever-bickering brothers turn cooking Thanksgiving dinner into a competition for the best turkey, stakes being Percy staying away for years or Lou signing as guarantor for his restaurant, but an alternative is found after a fire starts in Lou's kitchen during their fight gone physical again.

Episode 9
Fri, Nov 30, 201843 mins
Trevor Wahale, who made a career of performing many legitimate vigilante acts in superhero suit, posted on Internet, is found murdered, his home was searched but no valuables appear stolen. He recently got competition from theatrical fake-flashy superhero The Guardian, whose alibi checks out. However fellow comics fan Jerry finds a clue to his hidden secrets while finding out he sold his vintage comics collection to launch his autobiographic own story series, a hidden room storing countless recordings about old cases, also involving his late father Gene and retire police captain Ishikawa. Meanwhile the Yakuza heads depose their banker, possibly key to the murder of Adam's criminal sister.

Episode 10
Fri, Dec 7, 201843 mins
McGarrett is badly wounded by an escaping attacker at home after several former SEAL mates were recently killed in their homes. He leaves the team research in Hawaii and travels alone, even without junior, to retired Joe White's ranch in Montana, where they also receive Tim Cole, the last other survivor -besides uncooperative jailed CIA traitor Greer- of their SEAL team which was to kill jihadist terrorist leader Hassan but spared his then 10-year-old son Omar, now a vindictive businessman. The rest of the Five-0 looks into the person who is trying to seek revenge. When the SEAL trio stand a gun battle against a dozen assassins, those and Joe get shot and he later dies from hopeless liver injuries, near his dream tree.

Episode 11
Fri, Jan 4, 201943 mins
Having buried Joe on his Montana ranch, Steve welcomes Danny, Junior and a whole team of surviving SEALs to avenge Joe, after having bloodily beaten Omar Hassan's whereabouts out of his Copenhagen lawyer Gregers Thomsen. The trail leads to his Laotian casino connection, so Steve and Catherine take on his cash henchman there. Meanwhile, ordered to stay back home, Adam ,Grover and Tani investigate the disappearance of a bag of bones found abandoned in a storage locker where the teens -including a cousin of Noelani, who called her- who bought it a blind auction were killed to steal it back.

Episode 12
Fri, Jan 11, 201943 mins
Koa was beaten up while looking after favorite junkie rehab charge Alana, so sister Tani helps -albeit using illegal force- track her down, murdered by heroine OD while she had needle-phobia, to cover up a mob-controlled network of doctors selling fake opiate prescriptions. STeve borders on abusive force while taking over Danny's quest for the speeding car which forced off the jungle road his teen daughter Grace, who got injured with her teen party buddy and is the formal prime suspect, with some teen Internet complications. Despite Danny's ex Rachel Hollander's continuous inadequacy, sharing the fear for Grace and learning her second marriage is another failure, they seem to reconcile.

Episode 13
Fri, Jan 18, 201943 mins
A male corpse washed up from the ocean is soon identified as a researcher, murdered aboard the private deep-sea research station of tycoon Claude Nostromo, who claims there was no motive. Steve puts Junior in charge of Adam and Tani as forensic team going down, but they find the other crew in panic or also killed, one while they're there. They find the motive must concern the illegal rare metal mining prospecting, but also that the oxygen is running dangerously low due to sabotage. Steve doesn't wait for the coast guard rescue, which can't arrive in time, but races by speedboat with Danny, who can't stop him from delivering oxygen by dangerous rapid dive.

Episode 14
Fri, Feb 1, 201940 mins
The Five-0 task force investigates the murder by ninefold stabbing of Flippa's friend and fellow ukulele band member Luka Palakiko, a gentle idealist and social worker specialized in LGBT youth. Only his minivan was stolen, without valuable cargo. Suspect Connor Russell, a white supremacist, released from prison four months ago, is preparing a bombing, improvising explosives from fertilizer. Steve's team must follow his bloody trail before he can strike, seeking clues from his seemingly converted former cellmate Roger Barton. Grover confides he once dealt with a similar situation in Chicago.

Episode 15
Fri, Feb 15, 201943 mins
Special Agent Sam Collins's FBI team seeks 5O's assistance to guard notorious escape-artful cartel boss Alejandro Vega, who has a macabre reputation, in their maximal security cell during a hurricane preventing all flights to his mainland trial. Junior and Tani are separately detailed to help with evacuations, but she stumbles upon a couple refusing to leave badly enough to tie her up. Only after a security guard is stabbed by an intruder who releases gas into Vega's cell, Collins reveals he's turned witness against rival drug gangs.

Episode 16
Fri, Feb 22, 201943 mins
Five-0 task investigates the poisoning of Gwendoline Baker, the top salesperson of a beauty company. McGarrett finds out that the company is a pyramid scheme and that Baker was about to unmask owner Jocelyn Greene's fraudulent practices. Tani shares a personal story that involves the case. Adam, who has just moved into a new home, generously helps a homeless veteran trying to reconnect with his family on the mainland, not just to a gift for his kid granddaughter's birthday, but a ticket and makeover.

Episode 17
Fri, Feb 22, 201943 mins
Five-O has to chase down a group of murderous bank robbers after they just shot their way out of the bank.

Episode 18
Fri, Mar 8, 201941 mins
Danny's British socialite ex-mother-in-law Amanda 'Mandy' Savage, a famous romance novelist, arrives to present her latest work, but her regular security agent is out due to passport problems, so she commandeers ever-despised Danny, who gets McGarrett to come along, meet and like her -mutually, on first name base, as she digs a sexy former SEAL officer and gentleman- and act as her chauffeurs. Danny and Amanda initially butt heads but finally make up, both wanting the best for Rachel. Five-0 investigates a series of lethal steroid injections going around Honolulu. The initial fatal OD victim inadvertently robbed the wrong drug from the actual suspect dealer, whose trail leads to a gym, where super-fit Junior and Tani go undercover at a local gym as potential buyers.

Episode 19
Fri, Mar 15, 201943 mins
Five-0 investigate the murder of a window washer and find that the victim is actually a renowned street artist who may have a politically motivated bounty on his head. Also, Grover and Adam look into the murder of a gambler, and Junior helps his father when they are reminded of his sister's death.

Episode 20
Fri, Apr 5, 201942 mins
Junior's semi-dodgy friend Hilo comes clean having helped a junkie sell to a scary teen girl a .38 caliber revolver, which McGarrett and the rest of the Five-0 members find to be a "community gun", used in over 47 cases including multiple homicides, so it's about impossible to work out who commit which with it. The gun was last used to murder the beached-up stepfather of buyer Bonnie, Owen Pearsen. The gun was surprisingly somehow connected to multiple Five-0 members: used to kill Duke's former partner, in a cold case of Steve's cop dad John, a deadly shop-robbery Danny walked into the day he moved to Oahu, and was used by Tani's ex-boyfriend who was a gang banger and let her softy 'kid' brother play macho with it.

Episode 21
Fri, Apr 12, 201942 mins
The Five-0 task force investigates the murder of a dodgy private investigator who was getting close to solving a 20-year-old cold kidnapping case, hired by the father, who never accepted the police closing the case and is after bloody vengeance, but she's found alive and well. Borrowing an apartment to run surveillance, Steve and Danny find that a senior childless victim from a previous case has left Steve her porcelain cats collection and her rare breed cat to a doting ex-con neighbor, who is disqualified, but neither detective can take a feline, so Danny hastily sees it's adopted by a third party.

Episode 22
Fri, Apr 26, 201942 mins
Five-0 investigates the murder of an undercover FBI agent, notably Adam, as the victim was about to be married to Yakuza boss Hajime Masuda's daughter Tamiko, triggering extraordinary truth times. Noelani is missing, as turns out kidnapped and forced to assist her former mentor Dr. Tara Chu in performing life-saving transplant of a corpse's organ she had to bring on a crime lord, supervised at gunpoint by his devoted, even more ruthless son, only to find out her former mentor turns out to be working with the criminal boss and is shot and killed.

Episode 23
Fri, May 3, 201942 mins
Steve is grumpy his kid sister Mary, on vacation visit, stays not with him -invoking cat allergy- but at a B&B, yet helps her 'straighten out' the owner, who seems a liar, so they spy on the shady neighbors after a crafty neighbor boy offers his drone observations if Steve helps him recuperating it. Mary breaks into the neighbors' house, finding with Steve a basement full of weapons and dangerous chemicals. Five-0 investigates the murders of a ride-share driver and his passenger, linked to drugs trade and worse. The seniors tease the juniors of Five-0 after Tani asks Junior 'no strings' as escort to a wedding..

Episode 24
Fri, May 10, 201943 mins
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.

Episode 25
Fri, May 17, 201942 mins
Five-0 frantically searches for Aaron Wright but runs into many dead-ends as he ruthlessly ties up dead ends and arranged to plant malware on Jerry's system. Aaron is later arrested and, in exchange for leniency, assists in finding the deadly weapons he already sold to a backup client. Junior begins searching for his father after he, disappointed since the trial, and his gun go missing. Later, the wife of the man who killed Joe White and Steve's SEAL team asks to make up at Five-0 but opens fire in the office with McGarrett and Jerry in the line of fire.
