O Ka Mea Ua Hala, Ua Hala Ia.
Grover must prevent a man who is accused of killing his wife from committing suicide.
Ka Hopu Nui ‘Ana
(The Round Up) When an FBI agent who was cracking down on organized crime is killed, McGarrett rounds up every gang-related criminal on the island to find the culprit. Also, McGarrett tasks Adam with forming a new division within Five-0 to take on organized crime.
Oni Kalalea Ke Ku a Ka La’au Loa
Danny tells Charlie a bedtime story about a case involving bad Santas, and a holiday miracle.
Make Me Kai
McGarrett, Danny, Tani, and Junior are exposed to a deadly biological weapon; the rest of the team has eight hours to find an antidote.
He Kaha Lu’u Ke Ala, Mai Ho’okolo Aku
McGarrett poses as a pilot to investigate a plane crash that led to the death of a pilot in an air race.
Kau Ka ‘Onohi Ali’i I Luna
A bank heist in progress forces Steve to make a potentially heartbreaking mistake; Adam faces an empty home without Kono.
Mohala I Ka Wai Ka Maka O Ka Pua
The murder of two tourists leads the team to a man who has multiple personality disorder; Danny and the others hire a stress management consultant to help McGarrett.
Kama’oma’o, Ka ‘Aina Huli Hana
At Halloween, the team investigates a string of murders that mirror stories from well-known Hawaiian folklore; Grover visits a man hours away from execution who may hold the key to a case that has plagued Grover for years.
E Uhi Wale No ‘A’Ole E Nalo, He Imu Puhi
When the HPD system is hacked and one of the Five-0’s informants ends up dead, McGarrett enlists the help of hacker Aaron Wright, who he just imprisoned.
Kau pahi, ko’u kua. Kau pu, ko’u po’o (Your Knife, My Back. My Gun, Your Head.)
Five-0 enlists the help of an old friend when the boss of a major crime family is murdered, triggering revenge killings across the island. Also, MacGarrett and Danny begin sorting out particulars in their new restaurant venture.