Picking up where Season 3 left off, we find McGarrett and Wo Fat cornered by unknown assailants in a detainment facility in season 4 of Hawaii Five-0, forcing McGarrett to break the law and turn on his own in order to find a kidnapped Catherine. Meanwhile Kono and Adam's secret location in Hong Kong is compromised, and Kono and Adam fight to stay alive when their hidden location is discovered.
Episode 1
Aloha Ke Kahi I Ke Kahi (We Need Each Another)
Sep 27, 2013
After McGarrett and Wo Fat narrowly escape from maximum security, gunmen storm Five-0 headquarters, compromising Kono and Adam's secret location in Hong Kong and forcing McGarrett to break the law and turn on his own in order to find a kidnapped Catherine.
Episode 2
A‘ale Ma‘a Wau (Fish Out of Water)
Oct 4, 2013
As the Five-0 team members investigate a murder, they are led to a Texas ranger who came to Hawaii to look for his daughter; Adam and Kono fight to stay alive.
Episode 3
Ka ʻoiaʻiʻo ma loko (The Truth Within)
Oct 11, 2013
A conspiracy theorist helps Five-0 when a missing artifact is the key to solving a double murder.
Episode 4
A Ia La Aku (From This Day Forward)
Oct 18, 2013
Five-0 investigates the murder of a wedding crasher, and their prime suspect is the runaway bride. Meanwhile, Danny makes a big decision regarding his relationship with Gabby.
Episode 5
Kupu‘eu (Fallen Hero)
Oct 25, 2013
As Catherine’s seemingly harmless surveillance job takes a deadly turn, Adam considers making the ultimate sacrifice to save Kono.
Episode 6
Kupouli ‘La (Broken)
Nov 1, 2013
When Halloween comes to Hawaii and a zombie-like man is shot, Five-0 races to stop a madman who is conducting experiments on humans.
Episode 7
Ua Nalohia (In Deep)
Nov 8, 2013
While working the murder case of an undercover ATF agent, McGarrett and the Five-0 team are tasked with watching Mary’s newly adopted baby after she gets sick.
Episode 8
Akanahe (Reluctant Partners)
Nov 15, 2013
McGarrett and Grover must work together to protect national security after they are tasked by the Governor to serve a warrant to a young computer hacker.
Episode 9
Hau‘oli La Ho‘omaika‘i (Happy Thanksgiving)
Nov 22, 2013
As Thanksgiving approaches, Five-0 investigates the murder of a secret service agent just as the President travels to Oahu. Also, McGarrett's Aunt Deb visits, bringing with her a shocking secret.
Episode 10
Ho‘onani Makuakane (Honor Thy Father)
Dec 13, 2013
The attempted murder of a Pearl Harbor veteran leads Five-0 to use decades old evidence to investigate a deadly crime committed within the internment camps on Oahu during World War II.
Episode 11
Pukana (Keepsake)
Dec 20, 2013
An investigation involving a potential serial killer puts Chin's life in danger; Grace and Danny find a mysterious puzzle box.
Episode 12
O Kela Me Keia Manawa (Now and Then)
Jan 10, 2014
Captain Grover is aided by McGarrett in his search for a friend who has disappeared, after it seems like he's committed murder. Kono persists in her quest to find Adam.
Episode 13
Hana Lokomaika‘i (The Favor)
Jan 17, 2014
Chin is questioned about his father's murder and how his relationship with Malia and her family could have adversely affected the investigation.
Episode 14
Na hala a ka makua (Sins of the Father)
Jan 31, 2014
An escaped convict who wants Five-0 to prove his innocence abducts Danny and McGarrett; Grace punches a person at school.
Episode 15
Pale'la (Buried Secrets)
Feb 28, 2014
A real estate agent is found dead inside the walls of one of his listings. Meanwhile, Danny's mother makes an unexpected visit and brings with her some shocking news.
Episode 16
Hoku Welowelo (Fire in the Sky)
Mar 7, 2014
A triple homicide is linked to a secret, downed Chinese satellite; Danny's mother goes on a ride-along with Grover.
Episode 17
Ma Lalo o ka ʻlli (Beneath the Surface)
Mar 14, 2014
A man is shot as his daughter is abducted; Danny tries to reunite his parents; Jerry finds a code on McGarrett's champ box.
Episode 18
Ho‘i Hou (Reunited)
Apr 4, 2014
Fan-built Episode. Five-0 investigates when the daughter of a macadamia nut tycoon is murdered with a stiletto heel during Chin’s high school reunion.
Episode 19
Ku I Ka Pili Koko (Blood Brothers)
Apr 11, 2014
Five-0 is set up when a bad tip leads them to an abandoned building that is rigged to explode with McGarrett and Danny trapped inside.
Episode 20
Pe‘epe‘e Kānaka (Those Among Us)
Apr 25, 2014
The investigation of a murdered pool cleaner leads the Five-0 team to a possible terrorist cell of radicalized students plotting an attack on U.S. soil.
Episode 21
Makani ʻOlu a Holo Malie (Fair Winds and Following Seas)
May 2, 2014
McGarrett and Catherine travel overseas to Afghanistan to stop the Taliban from harming a young boy whose family saved Catherine's life years ago.
Episode 22
O ka Pili ‘Ohana Ka ‘Oi (Family Comes First)
May 9, 2014
When Grover's daughter is kidnapped by an old nemesis, he is forced to help steal $100 million in order to get her back. Meanwhile, Wo Fat escapes prison and heads back to Oahu.