Season 4

01 Aloha Ke Kahi I Ke Kahi (We Need Each Another) Episode 127th September 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. 02 A‘ale Ma‘a Wau (Fish Out of Water) Episode 24th October 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. 03 Ka ʻoiaʻiʻo ma loko (The Truth Within) Episode 311th October 2013 A conspiracy theorist helps Five-0 when a missing artifact is the key to solving a double murder. 04 A Ia La Aku (From This Day Forward) Episode 418th October 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. 05 Kupu‘eu (Fallen Hero) Episode 525th October 2013 As Catherine’s seemingly harmless surveillance job takes a deadly turn, Adam considers making the ultimate sacrifice to save Kono. 06 Kupouli ‘La (Broken) Episode 61st November 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. 07 Ua Nalohia (In Deep) Episode 78th November 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. 08 Akanahe (Reluctant Partners) Episode 815th November 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. 09 Hau‘oli La Ho‘omaika‘i (Happy Thanksgiving) Episode 922nd November 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. 10 Ho‘onani Makuakane (Honor Thy Father) Episode 1013th December 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. 11 Pukana (Keepsake) Episode 1120th December 2013 An investigation involving a potential serial killer puts Chin's life in danger; Grace and Danny find a mysterious puzzle box. 12 O Kela Me Keia Manawa (Now and Then) Episode 1210th January 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. 13 Hana Lokomaika‘i (The Favor) Episode 1317th January 2014 Chin is questioned about his father's murder and how his relationship with Malia and her family could have adversely affected the investigation. 14 Na hala a ka makua (Sins of the Father) Episode 1431st January 2014 An escaped convict who wants Five-0 to prove his innocence abducts Danny and McGarrett; Grace punches a person at school. 15 Pale'la (Buried Secrets) Episode 1528th February 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. 16 Hoku Welowelo (Fire in the Sky) Episode 167th March 2014 A triple homicide is linked to a secret, downed Chinese satellite; Danny's mother goes on a ride-along with Grover. 17 Ma Lalo o ka ʻlli (Beneath the Surface) Episode 1714th March 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. 18 Ho‘i Hou (Reunited) Episode 184th April 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. 19 Ku I Ka Pili Koko (Blood Brothers) Episode 1911th April 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. 20 Pe‘epe‘e Kānaka (Those Among Us) Episode 2025th April 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. 21 Makani ʻOlu a Holo Malie (Fair Winds and Following Seas) Episode 212nd May 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. 22 O ka Pili ‘Ohana Ka ‘Oi (Family Comes First) Episode 229th May 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.