Steve McGarrett returns home to Oahu, in order to find his father's killer. The governor offers him the chance to run his own task force (Five-0). Steve's team is joined by Chin Ho Kelly, Danny "Danno" Williams, and Kono Kalakaua.
The best episode of "Hawaii Five-0" season 4 is "Aloha Ke Kahi I Ke Kahi (We Need Each Another)", rated 8.5/10 from 806 user votes. It was directed by N/A and written by N/A. "Aloha Ke Kahi I Ke Kahi (We Need Each Another)" aired on 9/27/2013 and is rated 0.5 point(s) higher than the second highest rated, "A‘ale Ma‘a Wau (Fish Out of Water)".
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.
Director: N/A
Writer: N/A
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.
Director: Joe Dante
Writer: N/A
A conspiracy theorist helps Five-0 when a missing artifact is the key to solving a double murder.
Director: Duane Clark
Writer: Steven Lilien, Bryan Wynbrandt
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.
Director: N/A
Writer: N/A
As Catherine’s seemingly harmless surveillance job takes a deadly turn, Adam considers making the ultimate sacrifice to save Kono.
Director: N/A
Writer: N/A
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.
Director: N/A
Writer: N/A
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.
Director: Joe Dante
Writer: N/A
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.
Director: Jerry Levine
Writer: Steven Lilien, Bryan Wynbrandt
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.
Director: N/A
Writer: N/A
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.
Director: N/A
Writer: N/A
An investigation involving a potential serial killer puts Chin's life in danger; Grace and Danny find a mysterious puzzle box.
Director: Bryan Spicer
Writer: N/A
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.
Director: Peter Weller
Writer: N/A
Chin is questioned about his father's murder and how his relationship with Malia and her family could have adversely affected the investigation.
Director: Sylvain White
Writer: Peter M. Lenkov
An escaped convict who wants Five-0 to prove his innocence abducts Danny and McGarrett; Grace punches a person at school.
Director: Peter Weller
Writer: N/A
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.
Director: N/A
Writer: N/A
A triple homicide is linked to a secret, downed Chinese satellite; Danny's mother goes on a ride-along with Grover.
Director: Jeffrey G. Hunt
Writer: Steven Lilien, Bryan Wynbrandt
A man is shot as his daughter is abducted; Danny tries to reunite his parents; Jerry finds a code on McGarrett's champ box.
Director: Bryan Spicer
Writer: Bill Haynes, John Dove
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.
Director: N/A
Writer: N/A
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.
Director: Maja Vrvilo
Writer: N/A
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.
Director: N/A
Writer: N/A
McGarrett and Catherine travel overseas to Afghanistan to stop the Taliban from harming a young boy whose family saved Catherine's life years ago.
Director: Jeffrey G. Hunt
Writer: Eric Guggenheim, Peter M. Lenkov, Ken Solarz
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.
Director: Bryan Spicer
Writer: Peter M. Lenkov, Ken Solarz