|Mai Ka Wa Kahiko- (Out Of The Past)|
|Season 2, Episode 15|
|Air date||February 6th, 2012|
I Helu Pu (episode).
Mai Ka Wa Kahiko- (Out Of The Past) is the 15th episode of Season 2 of the 2010 remake version of Hawaii Five-0.
The team investigate when the body of a Federal Marshal is found in the bathroom on a plane and Danny is stunned when he learns that the victim is someone he knew. The stakes are then raised after Grace is kidnapped and Danny soon discovers that the person responsible for the killing is none other his former New Jersey partner who has arrived in Hawaii, hellbent on getting revenge on Danny. With Grace's life in the balance, Danny must do whatever his former partner says or risk losing Grace forever...
As the investigation progresses further, the team discover that the prisoner the victim was escorting, "Rick Maguire" is an alias as the real "Rick Maguire" died two years previously.
It's soon discovered that the main suspect in Rick Peterson, Danny's ex-partner from his days as a cop in New Jersey. After being found guilty of corruption, a trial that Danny also testified in, Peterson was jailed for ten years and ended up losing everything including his wife and family.
Now consumed by revenge, Peterson has come to Hawaii to get back at Danny.
When Grace is kidnapped by Peterson posing as an officer of the Honolulu Police Department, Danny goes off the grid to comply with Peterson's demands and furthermore, Danny is by himself as Peterson has also cloned Danny's phone, essentially gaining access to the contacts on Danny's phone which include members of the HPD and H50.
Peterson and Danny then meet with Peterson telling Danny to kill Stan Edwards, the current husband of Danny's ex, Rachel so that Danny himself would end up going to jail for murder and ultimately end up losing Grace forever.
As Danny and Stan meet, the rest of H50, having discovered that Peterson was taking photos of Grace discover Peterson's intentions and race to stop the plan from going ahead.
Lieutenant Commander Steve McGarrett (2010) arrives to stop Danny, only for Danny to shoot Stan. As Steve races to the scene, he discovers that Danny simply shot Stan in the arm, wounding him so that he could trick Peterson.
As Kono and Chin, Danny confronts Peterson, demanding that Peterson reveal where Grace is but when Peterson refuses, Danny responds by shooting Peterson in the right kneecap which leaves Kono horrified and stunned.
As Peterson lies on the ground, wounded, Danny tells him to give up the location or else he will shoot Peterson in the head.
Peterson eventually relents and reveals that Grace is being held in a storage container.
Steve and Danny race to the container and eventually find Grace with Danny, Rachel and Grace all having an emotional reunion as Steve, Chin and Kono all look on.
|Lieutenant Commander Steve McGarrett (2010)||Alex O'Loughlin||A Navy SEAL and the leader of the Hawaii Five-0 Task Force for Governor Sam Denning.|
|Detective Sergeant Danny Williams (2010)||Scott Caan||Second-in-command of the Hawaii Five-0 Task Force and also Steve's partner.|
|Detective Lieutenant Chin Ho Kelly (2010)||Daniel Dae Kim||A member of the Hawaii Five-0 Task Force.|
|Officer Kono Kalakaua (2010)||Grace Park||A member of the Hawaii Five-0 Task Force who graduated from the HPD Police Academy and who is also Chin's cousin.|
|Dr. Max Bergman||Masi Oka||Chief Medical Examiner for the Hawaii Five-0 team.|
|Grace Williams||Teilor Grubbs||Danny Williams's young daughter.|
|Lori Weston||Lauren German||A member of the Hawaii Five-0 team.|
|Stan Edwards||Mark Deklin||Rachel's husband and Grace Williams's stepfather.|
|Rachel Edwards||Claire van der Boom||Danny's ex-wife, Stan's wife and Grace William's mother.|
|Charlie Fong||Brian Yang||A Forensic Scientist with the Honolulu Police Department Crime Lab.|
|Rick Peterson||Peter Greene||Danny's former partner in New Jersey who arrived in Hawaii, hellbent on seeking revenge against Danny who testified at his trial ten years previously which ultimately led to Peterson being jailed. After kidnapping Grace, Danny's daughter, he attempts to get Danny to kill Stan Edwards so that Danny would go to prison, but Danny fakes it by shooting Stan in the shoulder before shooting Peterson in the right kneecap and then threatening to shoot him in the head if Peterson doesn't tell him where Grace is.|
|Flight Attendant||Denby Dung||A woman who appears in the episode.|
|Mark Dunkerley||Himself||A man who appears in the episode.|
|Manager||Paulette Franco||A man who appears in the episode.|
|Prosecutor||Tom Holowach||A man who appears in the episode.|
|Tennis Instructor||Rusty Komori||A man who appears in the episode.|
|Dave Collins||Jon Olson||The murder victim.|
|Sal Painter||Theo Rossi||A man who appears in the episode.|
|Attendant||Jabez Sky||A man who appears in the episode.|
|Holly Malone||Gloria Votsis||A woman who appears in the episode.|