After being accused of destroying a priceless piece of art, the team must pass a mandated psych evaluation Paige asks the team for help when Ralph is hesitant to go to the school Halloween party.
Walter and the team ask a troubled former associate for help when a nuclear reactor in Los Angeles is on the verge of a cataclysmic meltdown.
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.
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.
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.
When Chin is kidnapped and left in Halawa prison dressed as an inmate, he must escape before the other prisoners recognize him.
When a professor is murdered, his boss, his teaching assistant and a student all come under suspicion.
McGarret and Catherine meet a boy whose father is missing and could be in grave danger.
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.
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 thinks a smart, seductive therapist (Vanessa Marcil) murdered one of her patients one of Doris' former targets seeks revenge.
Sebastian is placed on administrative leave after being questioned by the FBI about a foot chase Pride and the team attempt to clear Sebastian's name.
The team investigates the copycat murder of an unsolved case from 150 years ago that spawned a legendary ghost story Gregorio is spooked when the case is connected to a recent séance and a local medium.
The team joins forces with FBI Director Isler after a Russian operative with intelligence on sleeper agents disappears Tammy partners with former sleeper agent Eva Azarova to assist in the disappearance.
An erratic whistleblower who calls Pride her mentor kidnaps him to help her locate a serial killer targeting young women in the Gulf of Mexico.
While Pride remains on probation after his rogue takedown of the corrupt Mayor Hamilton, his team is closely monitored by a strict supervisor the team must secretly investigate after the FBI takes the lead on a case involving stolen nuclear waste.
The investigation into the murder of a billionaire explorer who went missing 10 years earlier reveals Dr. Clark Edison as a suspect Cam's sister visits to help with wedding plans.
Booth's hockey knowledge comes in handy when the team investigates the death of a player whose headless corpse was left in the river Hodgins and Oliver use drones to see who can retrieve the victim's head.
The team hunts for a serial killer who appears to have sinister interactions with the victims' bodies before dumping them Booth and Aubrey consult a behavioral analyst to help find clues to the killer's identity.
The team investigates the death of a men's rights organization founder who may have been the victim of domestic abuse Brennan loses her temper during an interrogation Angela and the team struggle with Hodgins' bitterness.