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.

Season 4 Episode 1 - Aloha Ke Kahi I Ke Kahi (We Need Each Another)

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. Air Date : 27th-Sep-2013  Read More

Season 4 Episode 2 - A‘ale Ma‘a Wau (Fish Out of Water)

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. Air Date : 4th-Oct-2013  Read More

Season 4 Episode 3 - Ka 'oia' i' o ma loko (The Truth Within)

A conspiracy theorist helps Five-0 when a missing artifact is the key to solving a double murder. Air Date : 11th-Oct-2013  Read More

Season 4 Episode 4 - A Ia La Aku (From This Day Forward)

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. Air Date : 18th-Oct-2013  Read More

Season 4 Episode 5 - Kupu‘eu (Fallen Hero)

As Catherine’s seemingly harmless surveillance job takes a deadly turn, Adam considers making the ultimate sacrifice to save Kono. Air Date : 25th-Oct-2013  Read More

Season 4 Episode 6 - Kupouli ‘La (Broken)

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. Air Date : 1st-Nov-2013  Read More

Season 4 Episode 7 - Ua Nalohia (In Deep)

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. Air Date : 8th-Nov-2013  Read More

Season 4 Episode 8 - Akanahe (Reluctant Partners)

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. Air Date : 15th-Nov-2013  Read More

Season 4 Episode 9 - Hau‘oli La Ho‘omaika‘i (Happy Thanksgiving)

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. Air Date : 22nd-Nov-2013  Read More

Season 4 Episode 10 - Ho‘onani Makuakane (Honor Thy Father)

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. Air Date : 13th-Dec-2013  Read More

Season 4 Episode 11 - Pukana (Keepsake)

An investigation involving a potential serial killer puts Chin's life in danger; Grace and Danny find a mysterious puzzle box. Air Date : 20th-Dec-2013  Read More

Season 4 Episode 12 - O Kela Me Keia Manawa (Now and Then)

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. Air Date : 10th-Jan-2014  Read More

Season 4 Episode 13 - Hana Lokomaika‘i (The Favor)

Chin is questioned about his father's murder and how his relationship with Malia and her family could have adversely affected the investigation. Air Date : 17th-Jan-2014  Read More

Season 4 Episode 14 - Na hala a ka makua (Sins of the Father)

An escaped convict who wants Five-0 to prove his innocence abducts Danny and McGarrett; Grace punches a person at school. Air Date : 31st-Jan-2014  Read More

Season 4 Episode 15 - Pale'la (Buried Secrets)

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. Air Date : 28th-Feb-2014  Read More

Season 4 Episode 16 - Hoku Welowelo (Fire in the Sky)

A triple homicide is linked to a secret, downed Chinese satellite; Danny's mother goes on a ride-along with Grover. Air Date : 7th-Mar-2014  Read More

Season 4 Episode 17 - Ma Lalo o ka 'lli (Beneath the Surface)

A man is shot as his daughter is abducted; Danny tries to reunite his parents; Jerry finds a code on McGarrett's champ box. Air Date : 14th-Mar-2014  Read More

Season 4 Episode 18 - Ho‘i Hou (Reunited)

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. Air Date : 4th-Apr-2014  Read More

Season 4 Episode 19 - Ku I Ka Pili Koko (Blood Brothers)

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. Air Date : 11th-Apr-2014  Read More

Season 4 Episode 20 - Pe‘epe‘e Kānaka (Those Among Us)

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. Air Date : 25th-Apr-2014  Read More

Season 4 Episode 21 - Makani 'Olu a Holo Malie (Fair Winds and Following Seas)

McGarrett and Catherine travel overseas to Afghanistan to stop the Taliban from harming a young boy whose family saved Catherine's life years ago. Air Date : 2nd-May-2014  Read More

Season 4 Episode 22 - O ka Pili ‘Ohana Ka ‘Oi (Family Comes First)

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. Air Date : 9th-May-2014  Read More