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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.