From a CBS press release. Any errors are attributed to the original author(s).
[Stills will be posted when they are released]
McGARRETT AND FIVE-0 SEARCH FOR A BUSLOAD OF KIDNAPPED SCHOOL CHILDREN AS WELL AS THE PEOPLE RESPONSIBLE, ON “HAWAII FIVE-0,” MONDAY, DEC. 5
Ingo Rademacher (“General Hospital”) Guest Stars as the Father of One of the Missing Children
“Pahele”* – McGarrett and Five-0 search for a busload of kidnapped school children as well as the people responsible, on HAWAII FIVE-0, Monday, Dec. 5 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Ingo Rademacher (“General Hospital”) guest stars as the father of one of the missing children.
*”Pahele” is Hawaiian for “Trapped”.
SERIES REGULARS:
Alex O’Loughlin ………………. Steve McGarrett
Scott Caan ………….. Danny “Danno” Williams
Daniel Dae Kim ………………….. Chin Ho Kelly
Grace Park ……………………… Kono Kalakaua
Masi Oka …………………….. Dr. Max Bergman
Lauren German ……………. Officer Lori Weston
RECURRING CAST:
Terry O’Quinn …………………………. Joe White
Richard T. Jones .…………. Gov. Sam Danning
GUEST CAST:
Cary-Hiroyuki Tagawa …………. Hiro Noshimuri
Ian Anthony Dale ……………… Adam Noshimuri
Erin Wong …………………………… Ms. Christie
Mike Hipa ………………………………. Jay Katsu
Chester Tripp ………………………………. Freddy
Aimee Garcia ……………………………….. Karla
Christopher Simms ……… Capt. Grant Matthews
Erik Hidaka ……………………………… Parent #1
Linda Jameson …………………………. Parent #2
Kalama Epstein ……………………. Jason Schafer
Eddy Gudoy …………………………………. Driver
David Lee McInnis …………………… Ken Nakoa
Rick Gomez ……………………….. Mateo Vargas
Ingo Rademacher ………………. Malcolm Schafer
Christina Simpkins …………………. Mrs. Schafer
WRITTEN BY:
Melissa Glenn and Jessica Rieder
DIRECTED BY:
Paul Edwards

Hiro Noshimuri?!? Wasn’t he supposed to be killed in a car accident?
Well…maybe there is a flashback or something…
Hiro went to jail for Mary Ann’s kidnapping. His brother(Koji) was killed in the car accident. He is the one Steve suspected of killing his mother.