I ka wa ma mua, I ka wa ma hope. (The Future Is in the Past) – When Danny is shot while quarantined in the hospital with McGarrett, Tani and Junior, he’s left unconscious and clinging to life, imagining a future for everyone in Five-0.
Make me kai (Death at Sea) – When investigating a deserted yacht adrift at sea, McGarrett, Danny, Tani and Junior are exposed to a deadly bioweapon and the rest of Five-0 have only eight hours to find an antidote.
Ha kaha lu’u ke ala, mai ho’okolo aku (The Trail Leads to a Diving Place; Do Not Follow After) – McGarrett poses as a pilot to investigate the cause of a plane crash that led to the death of a pilot in an air race.
Kau ka ‘onohi ali’i i luna (The Royal Eyes Rest Above) – Junior and Adam back up McGarrett when a bank heist in progress forces Steve to make a potentially heartbreaking mistake. Also, Adam is forced to face an empty home without Kono.
“Mohala i ka wai ka maka o ka pua (Unfolded by the Water are the Faces of the Flowers)” – The murder of two tourists leads Five-0 to a man suffering from multiple personality disorder, where one of them becomes violent and another is a child. McGarrett is accompanied on the case by a stress management consultant, whom Danny and the others have hired to help him manage his health.
Kama’oma’o, ka ‘aina huli hana (At Kama’oma’o, The Land of Activities) – Five-0 investigates a string of murders on Halloween that mirror stories from well-known Hawaiian folklore. Meanwhile, Grover is called to visit 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 (No Matter How Much One Covers a Steaming Imu, the Smoke Will Rise) – The lives of Five-0’s informants are put in danger when the HPD system is hacked and one ends up dead, forcing McGarrett to enlist 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. Meanwhile, McGarrett and Danny begin sorting out particulars in their new restaurant venture.
Na La ‘Ilio (Dog Days) – McGarrett and Five-0 work with an injured police dog that is the only witness to an ambushed drug bust. Meanwhile, McGarrett is visited by Junior Reigns, a former Navy SEAL, who is looking to join the task force.
A’ole e ‘olelo mai ana ke ahi ua ana ia (Fire Will Never Say That It Has Had Enough) – Season 8 begins with McGarrett and Danny recruiting Tani Rey to join the task force when diabolical hacker Aaron Wright releases a dangerous arsonist from prison.