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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.
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.
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.
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.
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.
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.
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.
Danny and Chin are arrested for deadly past transgressions. McGarrett enlists Joe's help in the investigation.
Steve and Danny work on their relationship when they stake out the apartment of a woman who fled from a diamond robbery.
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 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.
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.
A patient infected with a contagious and lethal strain of bird flu is kidnapped and the culprits intend to weaponize the virus.
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.
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.
An old-school private detective helps Five-0 investigate the murder of a young woman who was secretly working as an escort.
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.
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.
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.
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.
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 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.
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.
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.
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.