Five-0 goes on a manhunt when a chemical spill permits six dangerous inmates to escape, including Kono's husband, Adam.
Five-0 tries to save a kidnapped college student from a dangerous vigilante. Meanwhile, Max, Kamekona and Flippa fight to survive after being shipwrecked.
When a woman is murdered in her home, Five-0 learns that one of their own has a deep connection to the victim's young daughter.
Trapped inside a dilapidated building in Oahu's Chinatown, Five-0 must protect a wounded Gabriel and plan their escape when enemy gunmen storm the building looking to kill him and anyone who gets in their way.
In order to stop a meth epidemic on the Island, McGarrett and Danny go undercover as pilots, but when McGarrett is seriously wounded, Danny is forced to break their cover in order to save his partner's life.
McGarrett refuses to listen to Danny's pleas to take it easy while recovering from surgery; Five-0 goes on the hunt for a serial killer as fear grows that it's not safe to travel to Hawaii.
Five-0 must work with rogue MI-6 agent Harry Langford to find a terrorist planning to cause nuclear reactors across Europe to meltdown. Also, McGarrett and Danny ask retired FBI profiler Alicia Brown to help them find their serial killer vigilante.
FBI profiler Alicia Brown is forced to join McGarrett in the hunt for the chess-piece killer when she finds a body in her bed. Meanwhile, Kono reconnects with a former surfing competitor who is now a disabled and homeless war veteran.
Five-0 must find McGarrett and Alicia when they are kidnapped by the serial killer they've been hunting.
When a cache of guns is stolen from a gun range, Five-0 discovers the culprit is intent on making a dramatic statement on gun violence.
On Halloween, the team investigates the murder of a medium who was apparently frightened to death by a poltergeist; a mysterious death cult kidnaps Kono and Adam.
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