A new ally helps McGarrett and Five-0 when mob bosses on the island are being targeted by an assassin. Also, Five-0 says goodbye to one of their own.
- Quinn Liu was introduced for the first time.
- The first meeting between Steve and Danny was indirectly mentioned when they pulled Quinn over.
- At the end of this episode, Jerry Ortega announced that he was stepping down as the special consultant following his shooting attempt.
- Azra Hassan
- 1 assassinated
- Tom Kendall
- Katrina Law makes her first appearance and officially joined as series regular status for this episode.
- Despite being credited Kimee Balmilero (Noelani Cunha) do not appear in this episode.
- This episode marks the final appearance of Jorge Garcia in the opening credits and also as a series regular as Garcia departed the H50 series shortly after this episode aired.
|Steve McGarrett||Alex O'Loughlin||A former Navy SEAL and the leader of the Hawaii Five-0 Task Force.|
|Danny Williams||Scott Caan||2nd-in-command of the H50 Task Force and Steve's partner.|
|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||Former Navy SEAL and turned into Five-0 Task Force|
|Lou Grover||Chi McBride||Former leader of the HPD SWAT, and newest member of H50.|
|Quinn Liu||Katrina Law||Former staff sergeant with Army CID|
|Kamekona||Taylor Wily||An associate of the H50 team, and owner of The Shrimp Truck.|
|Sgt. Duke Lukela||Dennis Chun||Sergeant with the Honolulu Police Department.|
|Wes Cullen||Rob Morrow||A man who appears in this episode.|
|Brooke||Katie Wee||A woman who appears in this episode.|
|Dr. Paulson||Paul S.W. Lee||A man who appears in this episode.|
|SWAT Commander||Eddie Anderson||A man who appears in this episode.|
|Zhang||Roland Nip||A man who appears in this episode.|
|Yakuza Leader||Wes Zane||A man who appears in this episode.|
|Mayor||Hank Holliday||A man who appears in this episode.|
|TV Anchor||Grace Lee||A woman who appears in this episode.|
|Yakuza Leader #2||Dennis Takeshita||A man who appears in this episode.|
|Singer #1||Lehua Kalima||A woman who appears in this episode.|
|Singer #2||Ryan Souza||A man who appears in this episode.|