At the center of "Chicago P.D." is Sgt. Hank Voight (Jason Beghe), who is at ground zero against the war on crime in Chicago. He will do almost anything to bring criminals to justice. In the past year, Voight has fought to turn over a new leaf, carefully navigating the situation at the P.D. with a new boss who has helped him and the unit adapt to a new reality.

His close-knit team of detectives share his passion for keeping the city safe, including Det. Jay Halstead (Jesse Lee Soffer), a committed and ethical detective who previously served in Afghanistan; Officer Adam Ruzek (Patrick John Flueger), a quick-thinker who often leads with his heart; Officer Kim Burgess (Marina Squerciati), a fearless former patrol officer whose research and astute observations often lead the team in the right direction; Officer Kevin Atwater (LaRoyce Hawkins), a bright and quietly charismatic member of the team; and Det. Hailey Upton (Tracy Spiridakos), a seasoned detective whose tough demeanor belies her complicated emotions.

Desk Sgt. Trudy Platt (Amy Morton) runs a tight precinct with a firm hand, although she lets her humor shine through from time to time.