Danny and Baez work with Texas Ranger Waylon Gates when they are put on a case to find the Lone Star Killer; after Eddie's partner mistakenly shoots an undercover cop, internal affairs accuses Jamie of not supervising properly.
Steve sees the aftermath of a gang of robbers dressed as Santa Claus; Danny tells Charlie a bedtime story involving a Christmas miracle; Junior takes a position on the Five-0 task force.
The detectives are on the trail of a team of off-road racers who have their sights set on taking out a fellow competitor for good.
The team gets involved in a prison riot after an inmate asks Hawkes to be at his execution, where he is confronted with faces from his past.
Reese and Finch become trapped in a hospital after the discovery of a deadly virus outbreak, a new recruit at Samaritan has second thoughts, and Shaw struggles with reality.