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A Set Up
Watch Hawaii Five-0 Season 4 Episode 19
"Ku I Ka Pili Koko (Blood Brothers)"
Original Air Date:

The team is set up and McGarrett and Danny are led to a building filled with explosives on Hawaii Five-0.

Chin's High School Reunion
Watch Hawaii Five-0 Season 4 Episode 18
"Ho'i Hou (Reunited)"
Original Air Date:

At Chin's high-school reunion, the daughter of a macadamia nut tycoon is murdered on Hawaii Five-O.

Hoping to Reconcile
Watch Hawaii Five-0 Season 4 Episode 17
"Ma Lalo o ka 'Ili (Beneath the Surface)"
Original Air Date:

Danny does all he can to get his parents back together on Hawaii Five-O.

Jorge Garcia Guest Stars
Watch Hawaii Five-0 Season 4 Episode 16
"Hoku Welowelo (Fire in the Sky)"
Original Air Date:

A top secret Chinese satellite is connected to a triple homicide and Grover takes Danny's mother on a ride along on Hawaii Five-O.

Melanie Griffth on Hawaii Five-0
Watch Hawaii Five-0 Season 4 Episode 15
"Pale'la (Buried Secrets)"
Original Air Date:

As the team investigates when a realtor's body is found in the walls of a house, Danny is stunned when his mother (guest star Melaine Griffith) comes to visit on Hawaii Five-O.

Danny & McGarrett are Handcuffed!
Watch Hawaii Five-0 Season 4 Episode 14
"Na hala a ka makua (Sins of the Father)"
Original Air Date:

When an escaped convict wants Five-0 to prove he is innocent, he kidnaps McGarrett and Danny on Hawaii Five-0.

Chin Is Questioned
Watch Hawaii Five-0 Season 4 Episode 13
"Hana lokomaika'i (The Favor)"
Original Air Date:

Chin is questioned by Internal Affairs about his father's murder 15 years ago on Hawaii Five-0

McGarrett Helps Grover
Watch Hawaii Five-0 Season 4 Episode 12
"O kela me keia manawa (Now and Then)"
Original Air Date:

McGarrett helps Grover find his missing friend under suspicious circumstances on Hawaii Five-0.

Christmas on Hawaii
Watch Hawaii Five-0 Season 4 Episode 11
"Pukana (Keepsake)"
Original Air Date:

It's Christmas time in Hawaii and Chin ends up in the crosshairs of a possible serial killer on Hawaii Five-O.

Memories of Pearl Harbor
Watch Hawaii Five-0 Season 4 Episode 10
"Ho'onani Makuakane (Honor They Father)"
Original Air Date:

When someone tries to murder a Pearl Harbor veteran, the Five-O team ends up using evidence linking back to a WWII internment camp on Hawaii Five-O.