Steve McGarret, a decorated Naval officer, returns to Hawaii to investigate his father's murder and is asked to head up an elite police task force.
Following the abduction of a former NSA cyberterrorism expert, the team must rescue the man and prevent a breach of national security.
An escalating gang war spills into the stands of a high-school football game, killing several people; an unlikely partnership arises.
A violent convict escapes from prison and kidnaps a young couple on vacation; McGarrett's estranged sister comes to town.
When the daughter of the U.S. ambassador to the Philippines is found dead, the governor tasks Five-0 with finding her abducted sister.
When the CEO of a successful surf company is murdered, Kono revisits her past; Five-0 is thrown into the varied but interconnected worlds of North Shore surfing.
A Navy SEAL accused of murder takes hostages and safe haven on a memorial battleship.
When Danny's ex-partner is found dead at a Hawaiian luau the Five-0 team's investigation leads them to some dirty cops and a powerful cocaine cartel.
The team must protect a ruthless dictator from an assassination.
A ring of thieves pulls off the heist of an armored car, killing two security guards and leaving the money behind; Danny must seek his ex-wife's help in the case.
The abduction of a woman and the murder of her husband on their honeymoon becomes the case of the Five-0 team; Dr. Max Bergman (Masi Oka) recognizes similarities to a string of unsolved homicides.
The man who murdered McGarrett's father resurfaces; Chin Ho's life is put in danger during a hostage situation.
McGarrett discovers new clues in his mother's murder when his sister is kidnapped.
After a high-speed chase, the team makes a gruesome discovery; Chin Ho and his former fiancee awkwardly reunite.
The head of the Tsunami Warning Center disappears just as the island is being evacuated for a terrible storm.
The team heads into the jungle to try to find a missing witness in a high-profile murder case before the assassins that are after her.
An afternoon pleasure cruise turns into a nightmare when pirates attack and take hostages.
The team must stop a vengeful bomber; Danny's fun-loving brother (Dane Cook) visits unexpectedly.
A science-fiction fan dressed as a superhero is murdered; McGarrett receives a visit from a CIA agent interested in finding Yakuza.
While on a hike, Danny and McGarrett find a murder victim; Chin Ho and Kono go home to visit their ailing aunt.
The team must stop a New York detective from retaliating against a crime boss who targeted his family.
After a famous photographer is murdered while doing a magazine shoot, Danny is happy to learn that he will be interviewing the swimsuit models.
After receiving valuable information from Agent Jenna Kaye, the team closes in on Wo Fat; Danny is exposed to a deadly neurological agent.