Chin awakens to find himself imprisoned inside Halawa Correctional Facility where faces from his past emerge with a vengeance. Meanwhile upon learning where Chin really is, Steve, Danny and Kono launch a rescue operation to save their friend and colleague before it's too late.
Lieutenant Chin Ho Kelly is drugged and abducted, later waking up behind bars at the Halawa Correctional Facility.
Chin attempts to escape but is taken to corrupt Detective Kaleo.
Criminal Sang Min sides with Chin and both attempt to escape together but Kaleo starts a prison riot, triggering a lockdown as the inmates riot.
Meanwhile, Steve McGarrett, Danny Williams and Kono Kalakaua become suspicious when Chin misses an appointment with a psychiatrist. They also discover that Paul Delano who is responsible for kidnapping Chin is the brother of corrupt cop Frank Delano who Chin killed in cold blood in La O Na Makuahine.
With time of the essence and access to the prison no longer an option, Steve, Danny and Kono use Kamekona Tupuola's helicopter to get to Halawa where they use a combination of smoke grenades and shotguns loaded with bean bags to stop the inmates from attacking them.
Chin and Kaleo later engage in a fight which ends with Chin killing Kaleo with Kono helping Chin to safety. The team also rescue nurse Leilani while Sang Min later escapes by posing as a prison guard.
Kono contemplates snooping into Adam's Yakuza affairs, and eventually manages to clone his cell phone.
- Kono Kalakaua is the only original cast member not to spend time in jail. Steve McGarrett spent just over a week in Halawa Maximin.  Chin spent 8 hours in Halawa Maximin,  and was later arrested 2 years later. . And Danny Williams spent a few days in a Colombian prision. 
|Steve McGarrett||Alex O'Loughlin||Former Navy SEAL and leader of the Hawaii Five-0 Task Force.|
|Danny Williams||Scott Caan||2nd-in-command of the Hawaii Five-0 Task Force and Steve's partner.|
|Chin Ho Kelly||Daniel Dae Kim||Former Detective for HPD and member of Hawaii Five-0 Task Force.|
|Kono Kalakaua||Grace Park||Youngest member Hawaii Five-0 Task Force and Chin's cousin.|
|Dr. Max Bergman||Masi Oka||Chief Medical Examiner for the Hawaii Five-0 team.|
|Catherine Rollins||Michelle Borth||A Navy Lieutenant and Steve McGarrett's on-off girlfriend.|
|Sang Min||Will Yun Lee||A criminal and human trafficker who has began to reform.|
|Leilani||Lindsay Price||A nurse in the Halawa Correctional Facility.|
|Adam Noshimuri||Ian Anthony Dale||Kono Kalakaua's boyfriend and former head of the Yakuza.|
|Detective Kaleo||Jason Scott Lee||A corrupt Detective imprisoned for killing Danny Williams's former partner. Dies after getting into a fight with Chin.|
|Kamekona||Taylor Wily||An associate of the H50 team, and owner of The Shrimp Truck.|
|Sgt. Duke Lukela||Dennis Chun||Sergeant with the Honolulu Police Department.|
|Dr. Charles Fong||Brian Yang||Forensic Scientist who works for the HPD and H50.|
|Joao Caetano||Troy Ignacio||A suspect the H50 team previously encountered during a case.|
|Dave Lockhart||Kila Packett||Another suspect the H50 team previously encountered during a case.|
|Paul Delano||Daniel Baldwin||Frank Delano's brother.|
|Warrick||Matt Gerald||A man who appears in the episode.|
|La O Na Makuahine ♦ Kanalua ♦ Lana I Ka Moana ♦ Popilikia ♦ Mohai ♦ I Ka Wa Mamua ♦ Ohuna ♦ Wahine'inoloa |
♦ Ha'awe Make Loa ♦ Huaka'I Kula ♦ Kahu ♦ Kapu ♦ Olelo Ho'Opa'I Make ♦ Hana I Wa 'Ia ♦ Hookman ♦ Kekoa ♦ Pa'ani ♦ Na Ki'i ♦ Hoa Pili ♦ Olelo Pa'a ♦ Imi Loko Ka 'Uhane ♦ Ho'opio ♦ He Welo 'oihana ♦ Aloha, Malama Pono