After a slew of brutal slayings, District 21, led by Sergeant Hank Voight go after a Columbian drug cartel cleaning house in Chicago. They discover D’Anthony who proves to be an asset in the investigation. At District, complicated histories and unit rivalries surface which could end up costing them one of their own. Meanwhile, Rookie Kyle Ruzek is pulled from the police academy by Olinski to join the team.
Elenco: Jason Beghe , Jesse Lee Soffer , Marina Squerciati , Patrick John Flueger , Laroyce Hawkins , Amy Morton , Elias Koteas , Jon Seda , Sophia Bush , Tracy Spiridakos , Brian Geraghty , Lisseth Chavez , Archie Kao .