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When the bodies of two serial killers are found on Five-O property with chess pieces in their mouths, McGarrett and the team hunt for a vigilante as fear grows that tourists aren't safe in Hawaii, on the seventh season premiere.

Five-O must work with rogue MI-6 agent Harry Langford to find a terrorist planning to cause nuclear reactors across Europe to meltdown. Also, McGarrett and Danny ask retired FBI profiler Alicia Brown to help them find their serial killer vigilante.

When FBI Profiler Alicia Brown finds a body in her bed, she is forced to join McGarrett in the hunt for the chess-piece killer. Also, Kono reconnects with a former surfing competitor, who is now a disabled and homeless war vet.

Five-O must find McGarrett and Alicia when they are kidnapped by the serial killer they've been hunting.

When a cache of guns is stolen from a gun range, Five-O discovers the culprit is intent on making a dramatic and potentially deadly statement on gun violence. Also, Kono and Adam are finally reunited when he is released from prison.

On Halloween, Five-O investigates the murder of a medium with a checkered past who was apparently scared to death by a poltergeist. Also, Kono and Adam are kidnapped by what appears to be a death cult.

Five-O must free McGarrett's mother, Doris, when Catherine informs them that she was captured and is about to be executed after attempting to free Wo Fat's imprisoned father.

While Danny chaperones Grace's winter formal, terrorists seize the venue and hold everyone hostage in order to kidnap a diplomat's son. Also, Danny and Grover are shocked to learn that Will is Grace's secret boyfriend.

When a conspiracy theorist with compelling evidence that JFK's cabinet ordered his assassination is murdered, Five-O investigates one of history's most notorious unsolved mysteries.

Five-0 investigates the 10-year-old cold case of a missing teen when a boy suffering from PTSD undergoes hypnosis and realizes he may have witnessed her murder. Also, Danny's sister, Bridget (guest star Missy Peregrym), visits Oahu for a business conference, and he suspects that she may be getting too close to a co-worker.

Five-O races to Mexico where Chin puts his life on the line after his niece Sara is kidnapped.

After Chin is kidnapped by a cartel in Mexico, Five-O must find and rescue him before he is executed by the group that's out for revenge.

As Max prepares to say goodbye to his Five-O ohana, they must investigate a murder during a police convention on the Island.

Five-O must go up against an aggressive U.S. marshall, Lincoln, when a man wanted for murder escapes capture and seeks asylum in the sovereign land belonging to the Nation of Hawaii.

When working a murder case involving the illegal practice of shark finning, Five-O uncovers the possibility that a former Nazi war criminal may be hiding out in an old leprosy colony in Hawaii.

While McGarrett and Danno celebrate Valentine's Day with their girlfriends, the rest of Five-O investigates the murder of a man taking a class on how to land women.

McGarrett and Five-O once again become entangled in the twisted mind games of serial killer Dr. Madison Gray when she stumbles into HPD covered in blood that matches Alicia Brown's, and claims amnesia.

McGarrett and Danny finally track down the missing uranium, which has been used to build a bomb located in the middle of the jungle. Now, they must carefully extract the unstable explosive through treacherous terrain before it detonates.

McGarrett and Kono suspect that an abused young girl may be the victim of a sex trafficking ring on the Island. Also, Chin and Grover investigate a murder at a sober living facility.

Five-O helps PI Harry Brown work the case of a kidnapped wealthy woman whose husband may have something to hide. Also, Rachel tells Danny that she is getting a divorce from Stan.

McGarrett and Five-O are captured and face certain death after tracking a dangerous nemesis to the Island of Lanai. Also, Grover takes his son to Chicago where he testifies against a dirty cop from his past.

While working the murder case of one of the last survivors of the USS Arizona, McGarrett learns about his grandfather's important role at Pearl Harbor.

Danny protects a coma patient showing signs of waking who was the key witness from his last HPD case before he met Steve and joined Five-O.

When McGarrett gets a tip that someone is plotting a terrorist attack on Oahu, Five-0 searches for those behind it before it's too late. Also, Chin and Abby have a very difficult decision to make.