E ho’oko kuleana (To Do One’s Duty) – The ex-wife of the man who shot Danny comes to Oahu and reveals how Danny’s protection during a dangerous domestic dispute when he was in New Jersey helped save her life. Also, Tani and Junior are assigned to walk the beat as uniformed officers for the day, and Adam is framed for the murder of the crime boss he has been tracking
Holapu ke ahi, koe iho ka lehu (The Fire Blazed Up, Then Only Ashes Were Left) -Adam’s mission to take down organized crime on the Island goes sideways when deadly chlorine gas he was using to bait a big fish falls into the wrong hands. Also, Adam begins to doubt Jessie’s allegiance.
O na hoku o ka lani ka i ‘ike ia Pae’ (Only the Stars of Heaven Know Where Pae Is) – Tani and Junior go undercover as prospective parents in order to infiltrate a private school where the headmaster was murdered. Also, Adam’s life is on the line when he is held captive and forced to produce a hidden massive amount of money.
He puko?a kani ?aina (A Coral Reef Strengthens Out Into Land) – McGarrett and Danny investigate the murder of a private detective whose client was killed the same way, and Adam sends Jessie into a dangerous situation with disastrous consequences. Also, Danny’s uncle, Vito, comes to town to help Danny and McGarrett get their restaurant up and running.
Na keiki a Kalaihaohia (The Children of Kalaihaohia) – When the corpse of a diamond smuggler is stolen from a graveyard, Five-0 tracks down his partner, Voss, who will stop at nothing to retrieve their latest batch of contraband. Also, Adam recruits a new confidential informant, Jessie Nomura; Tani gets a devastating call; and McGarrett tasks Pua to find his and Danny’s stolen tools.
O ka mea ua hala, ua hala ia (What is Gone is Gone) – When a man accused of killing his wife threatens to commit suicide, Grover reveals how he too was once on the brink of taking his own life.
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 (A Tall Tree Stands Above the Others) – It’s Christmas Eve and Danny tells Charlie a bedtime story about a recent Five-0 case involving bad Santas and a holiday miracle.
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.