Season 4

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The fourth season of Hawaii Five-0 premiered on September 27, 2013 on CBS and concluded on May 9, 2014. The season consisted of 22 episodes.

Description
The Hawaii Five-0 team faces some of their biggest challenges yet as they fight to keep paradise safe from the most dangerous criminals on the island. This season, Steve McGarrett (Alex O'Loughlin) and Detective Danny "Danno" Williams (Scott Caan) pursue an expert hacker and are taken hostage by an escaped convict who convinces them of his innocence while the danger of Kono's (Grace Park) relationship with the son of a Yakuza boss escalates. Chin Ho (Daniel Dae Kim) is investigated by Internal Affairs about his ties to the head of a drug cartel and Catherine (Michelle Borth) gains a spot on the team but must repay a debt of honor in Afghanistan. Joining the team this season is Captain Lou Grover (Chi McBride) who recently moved his family from Chicago to head the SWAT unit on the island. It's high-octane action that never lets up through 22 thrilling episodes that will keep you on the edge of your seat.
 * From the Region 2 DVD*

Main Cast

 * Alex O'Loughlin as Commander Steve McGarrett
 * Scott Caan as Detective Danny Williams
 * Daniel Dae Kim as Lieutenant Chin Ho Kelly
 * Grace Park as Officer Kono Kalakaua
 * Masi Oka as Dr. Max Bergman
 * Michelle Borth as Lieutenant Catherine Rollins
 * Chi McBride as Lou Grover (as also starring)

Recurring characters

 * Ian Anthony Dale as Adam Noshimuri
 * Taylor Wily as Kamekona Tupuola
 * Dennis Chun as Sergeant Duke Lukela
 * Jorge Garcia as Jerry Ortega
 * Teilor Grubbs as Grace Williams
 * Brian Yang as Charlie Fong
 * Taryn Manning as Mary McGarrett
 * Autumn Reeser as Gabrielle Asano
 * Lili Simmons as Amber Vitale (later Melissa Armstrong)
 * Mark Dacascos as Wo Fat
 * Terry O'Quinn as Joe White
 * Christopher Sean as Gabriel Waincroft
 * Shawn Mokuahi Garnett as Flippa Tupuola
 * Shawn Anthony Thomsen as Pua Kai
 * Richard T Jones as Governor Samuel Denning

Guest Stars

 * Reiko Aylesworth as Dr. Malia Waincroft
 * Michelle Hurd as Renee Grover
 * Nick Jonas as Ian Wright
 * Daryl Hannah as Cherie Tranton
 * Tim Daly as Ray
 * Alvin "Xzibit" Joiner as Jason Dekker

Trivia

 * Chi McBride would recur in this series and later he is now also starring in episode 10.
 * Michelle Borth announced that she is leaving the series and the end of this season.
 * Nick Jonas and Tim Daly where both guest appearance in this season.