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.
Guest stars
Dennis Chun
Duke Lukela
Teilor Grubbs
Grace Williams
Rumer Willis
Sabrina Lane
Keo Woolford
Det. James Chang
Brian Tee
Hideaki Kuroda
DJ Qualls
Marshall Demps
Corbin Bernsen
Henry Upton
- K
Kenneth Matepi
Dr. William Ellery
- M
Masayo Terao
Trauma Doctor
- K
Kawika Smith
Security Guard
- S
Steven Sung
CSU Tech
Yosef Kasnetzkov
Brock Upton
All episodes — Season 4
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S4 E1Aloha Ke Kahi I Ke Kahi (We Need Each Another)
Sep 27, 20137.643 min
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 kidn
S4 E2A‘ale Ma‘a Wau (Fish Out of Water)
Oct 4, 20137.844 min
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.
S4 E3Ka ʻoiaʻiʻo ma loko (The Truth Within)
Oct 11, 20137.944 min
A conspiracy theorist helps Five-0 when a missing artifact is the key to solving a double murder.
S4 E4A Ia La Aku (From This Day Forward)
Oct 18, 20137.844 min
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.
S4 E5Kupu‘eu (Fallen Hero)
Oct 25, 20136.844 min
As Catherine’s seemingly harmless surveillance job takes a deadly turn, Adam considers making the ultimate sacrifice to save Kono.
S4 E7Ua Nalohia (In Deep)
Nov 8, 20137.944 min
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.