|Season 6, Episode 14|
|Air date||February 19, 2016|
Umia Ka Hanu
Ke Koa Lokomaika'i
As Five-0 investigates a double homicide involving marital infidelity, McGarrett and his team recall their disastrous Valentine's Day experiences.
Danny Williams: I was not playing charades. Melissa and I were having ah, uh. What do you call it? An exchange of opinions.
- Adam Noshimuri, Sabrina Lane and Catherine Rollins were all mentioned, but do not appear.
- Jerry Ortega mentioned Strangers on a Train "Two strangers in unhappy marriages agree to kill each other's spouses with no apparent motive.
- 2 people
- Goof: Danny told Steve, when he was twelve he saw two sea lions mate at Turtle Back Zoo in West Orange, New Jersey. Turtle Back Zoo did not have sea lions until 2013.
|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 Hawaii Five-0 Task Force and Steve's partner.|
|Chin Ho Kelly||Daniel Dae Kim||A member of the Hawaii Five-0 Task Force, and Kono's cousin.|
|Kono Kalakaua||Grace Park||Youngest member of Hawaii Five-0, and who is Chin's cousin.|
|Dr. Max Bergman||Masi Oka||Chief Medical Examiner for the Hawaii Five-0 team.|
|Jerry Ortega||Jorge Garcia||A conspiracy expert and an associate of the H50 team.|
|Lou Grover||Chi McBride||Former leader of the HPD SWAT, and newest member of H50.|
|Masaharu Morimoto||Himself||Sushi restaurant owner|
|Kamekona||Teila Tuli||An associate of the H50 team, and owner of Wailoa Shave Ice|
|Abby Dunn||Julie Benz||Secret Internal's Affair investigator and Chin Ho's girlfriend.|
|Renee Grover||Michelle Hurd||Lou Grover's wife and mother of his children.|
|Melissa Armstrong||Lili Simmons||Danny Williams's longtime New Jersey girlfriend.|
|Sgt. Duke Lukela||Dennis Chun||Sergeant with the Honolulu Police Department.|
|Lynn Downey||Sarah Carter||Steve McGarrett's new lover interest.|