Danny works to help clear Steve's name with the help of an old friend. Kono is under an internal affairs investigation and is on leave.
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The team investgates the kidnapping of a teenager while Kono is being investigated by Internal affairs and a profiler is assigned to the team by the new governor.
When a Navy SEAL turns up dead, Joe asks McGarrett to take a second look at his death. Kono is spending time with a group of ex-cops that were rumored to be dirty, much to Chin's disappointment.
When a local deep sea diver is murdered, Five-0 heads out into the ocean to find the killer.
Five-0 is investigating the murder of a volleyball coach which leads to new evidence about one of their own. Chin and his former fiancee Malia find themselves spending time together.
Steve ends up in a charity MMA fight while investigating the murder of a local restaurant owner. Steve and Joe call NCIS Agent Kensi Blye to review a video of John McGarrett.
As the Five-0 team investigates a young couple killed while filming a documentary, Danny finds himself placed under a curse by a transient at the killing site.
The investigation into a plane crash and a dead custom agent leads the team to question if the victim was alive before takeoff. Danny finds himself taking in an abandoned dog.
A body discovered in the trunk of a stolen car is hard to identify because of the physical alterations to the victim. Since Danny is without a place to live, he is forced to sleep on Steve's couch.
Jenna Kaye seeks McGarrett's help in delivering a ransom to North Korea to rescue her fiancÚ. While investigating the death of a reporter, Five-0 comes across a link to Jenna.
When a busload of children go missing, the team must rescue the children and find those responsible.
A man left for dead in an abandoned bunker leads Five-0 to a case being investigated by Captain Fryer.
A professional hit on a teenager has Five-0 searching for the reason why in order to determine who killed her.
Chin Ho relates some earth shattering news to McGarrett concerning Joe White resulting in a hostile face-to-face. When Rachel goes into early labor Danny's on hand to help out.
A crooked cop who is seeking revenge against Danny decides to visit the island, putting Danny and his family in jeopardy.
When the actions of Five-0 almost result in an international incident, Lt. Governor Denning announces that one team member will lose their job.
A Hawaiian history buff tries to help Five-0 with their investigation of a man dressed as a Hawaiian NaKoa warrior who was found murdered in the jungle.
Five-0 investigate the mysterious death of a radio DJ and uncovers evidence that leads them to Tony Archer, a local PI and retired NYPD bomb expert.
McGarrett tracks down August March, a former diamond smuggler, to help clear his sister when she's arrested for smuggling conflict diamonds.
Max reveals some revealing information about his childhood in order to convince Five-0 that a serial killer is on the loose.
Hawaii Five-0 needs help when they encounter a terrorist who states that he has a deadly virus and will release if his demands are not met. The NCIS counter terrorism team stationed in Los Angeles sends over two of its agents to assist the HPD.
McGarrett captures Wo Fat in a special ops raid but he learns that the Yakuza have been trailing them and both of them are marked for death.
The team searches for a killer after an officer is killed.