|Kupouli 'la (Broken)|
|Season 4, Episode 6|
|Air date||November 1, 2013|
|Written by||Sue Palmer & David Wolkove|
|Directed by||John Terlesky|
It's Halloween in Hawaii and the team on the trail to find a doctor who's performing illegal experiments on people.
While Max is attending a Halloween party, a police officer shoots a crazed doctor Michael Besner who later infects Max too. Five-0 find traces of a drug that drug cartels use to control their victims. They soon realize that Besner entered a morgue to cut off the head of a corpse, Lisa Mills, who died in a car accident. She was presumed missing a year earlier before she resurfaced; Five-0 believe that Lisa was kidnapped after finding cameras in her car and apartment.
Ultimately, it is revealed she was kidnapped by William Ellery, a scientist who believes that criminals can be reformed if their brains are infected with parasites, however the experiments proved to have flaws, namely, the parasites cause cysts which causes the subject to black out.
Five-0 race to save Ellery's next victim, Brock Upton. However Brock manages to break free and kill Ellery in defense.
Meanwhile, Catherine finds one of Sato's lieutenants, Hideaki Kuroda in Hawaii.
- Dr. Max Bergman always dressed up like a Keanu Reeves characters for halloween
- Neo from The Matrix 
- Ted "Theodore" Logan from the 1989 classic Bill & Ted's Excellent Adventure. 
- Siddhartha from 1993's Little Buddha. 
- (Wearing Red jersy with a 9) The character Jotah from the 1991, Point Break. 
- Chevalier Raphael Danceny from 1988's Dangerous Liaisons 
- 'The titular character of the film John Wick 
- It's revealed that Danny is claustrophobic.
|Alex O'Loughlin||A Navy SEAL and leader of the Hawaii Five-0 Task Force.|
|Scott Caan||2nd-in-command of the Hawaii Five-0 Task Force and Steve's partner.|
Chin Ho Kelly
|Daniel Dae Kim||A member of the Hawaii Five-0 Task Force.|
|Grace Park||Youngest member of the Hawaii Five-0 Task Force, and cousin of Chin.|
|Dr. Max Bergman||Masi Oka||Chief Medical Examiner for the Hawaii Five-0 team.|
|Catherine Rollins||Michelle Borth||An Ex-Navy Lieutenant and Steve's on-off girlfriend.|
|Sgt. Duke Lukela||Dennis Chun||Sergeant with the Honolulu Police Department.|
|Grace Williams||Teilor Grubbs||Danny Williams's daughter and first born child.|
|Sabrina Lane||Rumer Willis||Max's girlfriend.|
|Hideaki Kuroda||Brian Tee||AKA "Ryu Nabushi", he is one of Sato's Lieutenants.|
|Sergeant James Chang||Keo Woolford||A Sergeant with the Honolulu Police Department.|
|Marshall Demps||DJ Qualls||A man who appears in the episode.|
|Henry Upton||Corbin Bernsen||A man who appears in the episode.|
|Lisa Mills||Dixie Rose||A woman who died in a car accident prior to the episode.|
|Dr. William Ellery||Kenneth Matepi||The killer.|
|Moviegoer||Joseph Dubiel||A man who appears in the episode.|
|Michael Besner||Scott Folsom||A man who appears in the episode.|