Zach Garcia

In the series premiere, after a slew of brutal slayings, District 21, led by Sergeant Hank Voight (Jason Beghe) go after a Columbian drug cartel cleaning house in Chicago. They discover D'Anthony (guest star Isaac White) 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 (Patrick Flueger) is pulled from the police academy by Olinski (Elias Koteas) to join the team.

Antonio's (Jon Seda) son was kidnapped and he has a feeling the Columbian drug gang is to blame. Pulpo (guest star Arturo Del Puerto), the Columbian gang leader, is being held in jail and suggests his release may trigger the release of Diego (guest star Zach Garcia). During the investigation, Halstead (Jesse Lee Soffer) learns some new information about Lindsay (Sophia Bush). Voight (Jason Beghe) offers Antonio a new approach to get information on Diego's whereabouts.

The Fitori murder case is brought to the intelligence unit and Voight's (Jason Beghe) son, Justin (guest star Josh Segarra), may be involved. Gradishar (guest star Robin Weigert) fills Antonio (Jon Seda) in on the arrangement between Internal Affairs and Voight which increases friction between Voight and Antonio. Back at the precinct Ruzek (Patrick Flueger) helps Burgess (Marina Squerciati) get back at desk sergeant Platt (guest star Amy Morton).

As Antonio’s (Jon Seda) life is now in question, Voight (Jason Beghe) and Platt (guest star Amy Morton) open up about their pasts. Jin (Archie Kao) is caught while tinkering with Voight’s computer and uses the only scapegoat possible to keep him in the clear. At the same time with Charlie (guest star Billy Wirth) back in town Lindsay (Sophia Bush) realizes she’s going to have to come clean about a few things. Halstead (Jesse Lee Soffer) finally gets answers he’s been wanting about Voight’s and Olinsky’s (Elias Koteas) past.

Antonio heads undercover with a dangerous robbery crew after a narcotics officer goes missing. Commander Fischer (guest star Kevin J. O’Connor) updates Voight (Jason Beghe) on a missing officer that Narcotics had deep undercover with a robbery crew. Antonio (Jon Seda) connected with one of the crew members years ago, so he’s asked to reestablish contact to help them find the officer. Meanwhile, Roman (Brian Geraghty) and Burgess (Marina Squerciati) are dealing with a squatter situation and they enlist Chicago Fire’s Mouch (guest star Christian Stolte) to help. Also starring Sophia Bush, Jesse Lee Soffer, Patrick Flueger, Elias Koteas, LaRoyce Hawkins and Amy Morton. Monica Raymund, Caleb Hunt, and Peter Jacobson guest star.