While McGarrett awaits trial for the murder of the governor, he receives an unexpected visit; Kono is suspended.
Lori Weston, an officer with excellent profiling skills, joins the Five-0 to ensure McGarrett and the team follow new rules set in place by Gov. Denning; a teenage paddleboard champion is abducted.
Joe White, McGarrett's mentor, asks the team to investigate the death of a Navy SEAL, which was previously ruled a suicide; Chin Ho is concerned when Kono starts fraternizing with a group of dirty ex-cops.
The team investigates the murder of a deep-sea diver famous for the valuable treasure he finds.
The team's investigation into a volleyball coach's murder reveals more bad news about Kono; Chin Ho reconnects with his ex-fiance.
McGarrett takes part in a charity MMA fight while investigating a wealthy restaurateur's murder; NCIS Agent Kensi Blye examines a video of McGarrett's father.
Two young people filming a documentary about a Hawaiian burial site are murdered; during the investigation, a drifter (Robert Englund) puts a curse on Danny.
The investigation into a plane crash reveals the customs agent on board was dead before takeoff; Danny cares for an orphaned dog.
The physically altered corpse of an unidentified man is found in the trunk of a stolen car; Danno crashes on McGarrett's couch.
McGarrett travels to North Korea with Jenna Kaye to deliver ransom to rebels holding her fiance hostage; the team investigates the murder of an investigative reporter who appears to have connections to Jenna.
McGarrett and the team search for a missing bus full of school children and those responsible for the crime.
On the night before Chin Ho's wedding, the team's investigation into a man left to die in an abandoned bunker intersects with Capt. Fryer's case.
When a teenager is murdered, the team must determine why she was targeted and if the person responsible was a hired professional.
Chin Ho shares news about Joe White that rocks McGarrett to his core; Danny is forced to play midwife when his ex goes into early labor.
When Danno and his family are targeted by a vengeful dirty cop from Danno's past, the team steps in to help.
When the team almost causes an international incident, Lt. Gov. Denning decides that one of them should be fired; Chin Ho faces the harrowing task of choosing a Valentine's Day gift for Malia.
The team investigates when a man dressed as a Hawaiian NaKoa warrior is found dead near the site of a war re-enactment.
The team crosses paths with a retired NYPD bomb expert while investigating the death of a famous talk-radio host.
When McGarrett's sister is arrested for smuggling diamonds, he enlists the help of an ex-con to set up a sting.
Max reveals shocking information about his childhood to help the team track a serial killer who may have ties to Max's past.
When a suspect threatens to release a deadly virus, the Five-0 teams up with Special Agents G. Callen (Chris O'Donnell) and Sam Hanna (LL Cool J).
When McGarrett finally gets to Wo Fat, he is stunned to learn that the Japanese Yakuza wants them both dead.