In the introductory episode of the series, the presence of several street gangs contributes to a tension-filled atmosphere. The Rookies are assigned with the challenge of maintaining order amongst the rivaling street gangs, with Willie Gillis arising as the mediator between the gangs.

Terry is run down by a car driven by the leader of a street gang in his old neighborhood. When one of the members of the gang is overheard calling for an ambulance, he is forced to kill Terry or he will be killed by the gang for betrayal.