The island of O'ahu goes on lockdown when Five-0 hunts a terrorist who starts using weaponized drones on civilians. Meanwhile, McGarrett and Danno must go for a mandated review with a psychologist, resulting in a session which looks a lot like couples therapy, on the fifth season premiere of HAWAII FIVE-0.
Five-0 investigates when the young daughter of a Navy Seal currently on a top-secret mission is kidnapped. Meanwhile, with his brother's life on the line, Danny must locate the $18.5 million he owes his captors.
Five-0 investigates when three female thieves unknowingly steal something during a tour bus robbery that makes them a serious target. Meanwhile, Danny searches for his brother’s hidden millions in order to exchange it for his life
When a Detroit hit man is taken out by one of his colleagues on the streets of Oahu, Five-0 is shocked to learn the killer's surprising motives. Meanwhile, Chin puts his career on the line to help Danny get the money he needs to save his bother's life.
On the fourth anniversary of his father's death, McGarrett meets a woman who helps him reopen the last unsolved case his father worked on before his death.
It's Halloween and Five-0 must track down a serial killer who is copying murders depicted in a cult slasher film. Meanwhile, McGarrett must help Jerry after he is kidnapped by the counterfeiters he has been tracking.
When McGarrett is kidnapped by Wo Fat, he experiences what would have happened to the team if they had taken a very different path, on the 100th episode of HAWAII FIVE-0.