Original air date: 09/23/2016 Runtime: 43:38 min. When the bodies of two serial killers are found on Five-0 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. Rosalind Chao guest stars as Governor Keiko Mahoe.
Original air date: 09/30/2016 Runtime: 42:53 min. Five-0 must work with rogue MI-6 agent Harry Langford (guest star Chris Vance) to find a terrorist planning to cause nuclear reactors across Europe to meltdown. Also, McGarrett and Danny ask retired FBI profiler Alicia Brown (guest star Claire Forlani) to help them find their serial killer vigilante.
Original air date: 10/07/2016 Runtime: 43:18 min. When FBI Profiler Alicia Brown (Claire Forlani) 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 (Kanya Sesser), who is now a disabled and homeless war vet. Elizabeth Röhm also guest stars as a police psychiatrist.
Original air date: 10/21/2016 Runtime: 41:03 min. When a cache of guns is stolen from a gun range, Five-0 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.
Original air date: 11/04/2016 Runtime: 43:45 min. Five-0 must free McGarrett’s mother, Doris (Christine Lahti), when Catherine (Michelle Borth) informs them that she was captured and is about to be executed after attempting to free Wo Fat’s imprisoned father. Also, Chin loses his appeal to have Sara’s adoption delayed, and she must move to Mexico.
Original air date: 12/09/2016 Runtime: 43:08 min. 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.
Original air date: 01/06/2017 Runtime: 43:47 min. After Chin is kidnapped by a cartel in Mexico, Five-0 must find and rescue him before he is executed by the group that’s out for revenge. Also, Grover goes undercover as a car salesman to investigate a murder that turns out to be far more complex and dangerous than expected.
Original air date: 02/17/2017 Runtime: 43:04 min. McGarrett and Five-0 once again become entangled in the twisted mind games of serial killer Dr. Madison Gray (Elizabeth Röhm) when she stumbles into HPD covered in blood that matches Alicia Brown's (Claire Forlani), and claims amnesia.
Original air date: 02/24/2017 Runtime: 43:25 min. MacGarrett 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. Singer Darius Rucker Guest Stars as Desmond Abati, the Bomb Maker.
Original air date: 04/14/2017 Runtime: 43:47 min. 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. Also, Adam uncovers bone fragments at his new construction job and asks Jerry to help him discreetly investigate.
Original air date: 04/28/2017 Runtime: 42:00 min. 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-0. Lori Petty guest stars as Nurse Jenny Kitson, and Michael Paul Chan guest stars as Danny's former HPD Captain, Tanaka.
Original air date: 05/12/2017 Runtime: 42:44 min. McGarrett risks his life when Five-0 attempts their most dangerous rescue yet of young girls trapped in the sex trafficking ring they have been tracking this year. Also, Kono, deeply affected by the case, makes a life-changing decision, on the seventh season finale.