Following the murder of an important family member, the team searches for Delano and Wo Fat.
McGarrett asks Catherine to help find his mother; the teams seek assistance from August March (Edward Asner) with a deadly art heist.
Danny and McGarrett's day at sea takes a deadly turn when their boat is hijacked.
McGarrett's mom pays him an unexpected visit while the team investigates a polo player's death.
As the team investigates a grisly murder, evidence suggests the killer is about to strike again.
Danny must hold completely still as technicians disarm a bomb he accidentally activated; McGarrett tries to distract his partner by sharing a story about a tough case.
The murder of a computer hacker prompts an investigation, and McGarrett tries to stage a reunion.
McGarrett thinks a smart, seductive therapist (Vanessa Marcil) murdered one of her patients; one of Doris' former targets seeks revenge.
A botched robbery puts Max and his crush (Rumer Willis) in danger; when a stalker targets a supermodel, Danny must come to her rescue.
McGarrett and a little girl are taken hostage by an armed man (Tom Arnold) during a camping trip with Grace; Kono meets Adam's brother, who was recently released from prison.
McGarret and Catherine meet a boy whose father is missing and could be in grave danger.
When a professor is murdered, his boss, his teaching assistant and a student all come under suspicion.
When Chin is kidnapped and left in Halawa prison dressed as an inmate, he must escape before the other prisoners recognize him.
The night before an election, the governor asks the team to investigate when a prostitute is found dead in a missing congressman's bed; Danny waits for a custody decision.
A double amputee (Peter Weller) goes after the police officers responsible for his injuries -- including McGarrett.
The team investigates the murder of a Lua master; McGarrett has a private investigator tail his mother.
Danny obsesses about the big game during all-pro weekend in Hawaii; a star football player helps the team investigate the murder of a tech executive.
When a murder victim lands in Dog the Bounty Hunter's vehicle, Catherine goes under cover and investigates at a local roller derby.
The team struggles to narrow down a suspect when threats against a company that endangers sharks turn deadly; Kamekona tries to earn his helicopter license.
McGarrett tells the story of his last mission in North Korea as he and Catherine cross into the country to retrieve a friend's remains.
Steve and the team allow a talk-show host (Aisha Tyler) and her crew to follow them for a day, but a run-in with Wo Fat leads to danger.
When a young girl's body is discovered 10 years after being kidnapped, the team searches for her abductors -- who have taken their next victim; Kono asks Catherine for a favor that could impact her relationship with Adam.
McGarrett helps his mother with a covert op in hope of retrieving an incriminating microfiche; Kono runs into danger as she closes in on Adam's secret.