Season 1

Season Summary
Season One of Hawaii Five-0 premiered on September 20, 2010 in the U.S. The finale aired and the season was concluded on May 16th, 2011.

Principle Cast
In order of character appearance
 * Alex O'Loughlin as Steve McGarrett (24/24)
 * Scott Caan as Danny Williams (24/24)
 * Daniel Dae Kim as Chin Ho Kelly (24/24)
 * Grace Park as Kono Kalakaua (24/24)

Recurring Cast

 * Taylor Willy as Kamekona (13/24)
 * Teilor Grubbs as Grace Williams (12/24)
 * Dennis Chun as Sgt. Duke Lukela (5/24)
 * Masi Oka as M.E. Max Bergman (4/24)
 * Will Yun Lee as Sang Min (4/24)
 * Jean Smart as Governor Pat Jameson (4/24)
 * Taryn Manning as Mary Ann McGarrett (3/24)
 * Michelle Borth as Catherine Rollins (3/24)
 * Kelly Hu as Laura Hills (3/24)
 * James Marsters as Victor Hesse (2/24)