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. (TV-14 V)
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. Rumer Willis and Corbin Bernsen guest star. (TV-14 V)
As Catherine's seemingly harmless surveillance job takes a deadly turn, Adam considers making the ultimate sacrifice to save Kono. Terry O'Quinn returns as Joe White.
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. Rebecca De Mornay guest stars.
A Five-0 murder investigation leads the team to help a Texas Ranger who comes to the island to find his missing daughter. Meanwhile, Kono and Adam fight to stay alive when their hidden location is discovered. Tim Daly guest stars.
Get caught up on Season 3 of Hawaii Five-0.
McGarrett must help his mother execute a covert op to retrieve an incriminating microfiche. Meanwhile, Kono's life is in danger when she closes in on Adam's secret. Treat Williams, Christine Lahti, Anthony Ian Dale and Daniel Henney return in this episode and guest stars Craig T. Nelson.
When the body of a young girl who was kidnapped 10 years earlier is discovered, Five-0 must hunt down the kidnappers who have now taken their next victim. Meanwhile, Kono asks Catherine for a favor that could damage her relationship with Adam. Mare Winnigham and Henry Rollins guest star.
When a murder victim falls where Dog The Bounty Hunter is apprehending a suspect, Five-0 sends Catherine in undercover at the local roller derby to find the culprit. Bounty Hunter Duane "Dog" Chapman and his wife Beth Chapman guest star.
It's an All-Pro football weekend in Hawaii and while Danny obsesses about the big game, Five-0 investigates the murder of a tech executive with the help of a star football player. Arian Foster, Pat Monahan, and Larry Manetti guest star.
Five-0 investigates the murder of a Lua master, and McGarrett hires a private investigator to follow his mother. Christine Lahti returns as Doris McGarrett, Treat Williams guest stars as Mick Logan, and Summer Glau guest stars as Maggie Hoapili.
An Aloha Girls camping trip with Grace turns deadly when an armed man takes McGarrett and a little girl hostage. Meanwhile, Adam introduces Kono to his dangerous brother who was recently released from prison. Tom Arnold guest stars.
McGarrett plays cat and mouse with a smart and seductive therapist he believes murdered her patient. Meanwhile, Catherine must hunt down one of Doris's old targets who is now seeking revenge. Vanessa Marcil and Carlos Bernard guest star.
While the team investigates the murder of a young computer hacker, McGarrett tries to stage a long-needed reunion between his mother and his sister.
It's Halloween in Hawaii and the clock is ticking when a grisly murder leads the team to a ritualistic killing, and evidence suggests that the killer will soon strike again.
McGarrett and Danny's relaxing day at sea takes a deadly turn when their boat is hijacked and they are left to die in the middle of the ocean.
Detectives Steve McGarrett, Danny Williams and Chin Ho Kelly provide law and order in Hawaii.
Hawaii Five-0: Season 1 clip - starring Alex O'Loughlin, Scott Caan, Daniel Dae Kim, Grace Park, Taryn Manning.
Hawaii Five-0: Kai E'e clip - starring Alex O'Loughlin, Scott Caan, Daniel Dae Kim, Grace Park, Taryn Manning. Directed by Duane Clark.