|When the Light Goes Out, the House Is Dark|
|Season 9, Episode 10|
|Air date||December 7, 2018|
|Written by||Paul Grellong|
|Directed by||Gabriel Beristain|
Truth Comes from the Night
Gone on the Road from which There Is No Returning
After fighting off an assassin in his own home, McGarrett and Joe White flee to Montana to prepare for a battle against those exacting revenge for a past SEAL mission.
- The galloping horse movements of Joe and McGarrett in close-up shots don't match the wide-angle shots. They're not really riding the horses. Also, the green-screen background is fairly obvious in those same close-up shots.
- At the end of this episode Joe White sadly passed away.
- Joe White
- Tim Cole
- Mark Howard
- Kieran Brewster
- John Lienhan
- McGarrett killed 7 people
Adam Noshimuri: Hey, should I call Danny? Let him know what's going on?
Steve McGarrett: Please, don't do that. Okay, he's on the mainland, he's-he's touring colleges with Grace. He gets a whiff of this, he's gonna be on the first plane back here. We don't need that.
- Despite being credited, Scott Caan, Taylor Wily, Dennis Chun and Kimee Balmilero do not appear in this episode.
- This episode did mark the final appearance of Terry O'Quinn in this series.
- First episode to air on December 7, the anniversary of the attack on Pearl Harbor. The attack is an important event in the history of both Hawaii and Steve's family.
|Steve McGarrett||Alex O'Loughlin||A former Navy SEAL and the leader of the Hawaii Five-0 Task Force.|
|Adam Noshimuri||Ian Anthony Dale||An associate of the H50 team, and Kono's husband.|
|Tani Rey||Meaghan Rath||Former HPD cadet, who was recruited by H50|
|Jerry Ortega||Jorge Garcia||A conspiracy expert and an associate of the H50 team.|
|Junior Reigns||Beulah Koale||Navy SEAL and friend of Steve McGarrett|
|Lou Grover||Chi McBride||Former leader of the HPD SWAT, and newest member of H50.|
|Agent Greer||Rochelle Aytes||CIA Agent, and had a short fling with Steve many years ago.|
|Joe White||Terry O'Quinn||Former Navy SEAL CO, and Steve McGarrett's mentor.|
|Tim Cole||Brad Beyer|
|Mark Howard||Joel Steingold|
|Kasper Bauer||David Agranov|
|Gakuto Kojima||Alvin Ing|
|Wyatt Howard||Alrico Dwayne Perkins Jr.|
|Joanna Howard||Chloe Ryan Corniel|
|Cynthia Howard||Ticondra Swartz|
|Omar Hassan||Christian Rockford|
|Young McGarrett||River Christian|