The waitress is getting married and Dee is jealous that she's beating her to the altar, so she tries to derail the wedding.
The gang's high school reunion has come at last; each of them recalls the events that shaped them into the people they are now.
The gang hatches a plan to repair their tarnished reputation in the eyes of former high-school classmates.
When Olinsky catches wind of a grieving father looking to avenge his daughter's death, he goes undercover as a hit man.
The investigation of a jogger's brutal murder in a park is blocked by a church offering sanctuary to the prime suspects; Rixton goes behind Voight's back to question a gang member in relation to the case.