"Wrong Side of the Bars": Antonio believes a Colombian gang is involved in his son's kidnapping; Halstead learns new information about Lindsay; Voight offers Antonio a new way to get information about Diego's whereabouts.
"Chin Check": Voight and the team check out a house that has been associated with a series of gangs; people from the past cause Halstead's temper to rise.
"Now is Always Temporary": Olinsky tries to protect his daughter; a counterfeiting operation is investigated; when a hoarder is arrested, more than clutter is uncovered.
"Thirty Balloons": Atwater and Burgess must keep their new patrol car in mint condition; the Intelligence Unit uncovers drug smuggling; Voight's behavior toward Lindsay drives her right where he doesn't want her; tensions rise between Olinsky and Ruzek.
"Conventions": New York's SVU agents Fin and Rollins help track down a serial killer who rapes his victims; Burgess gets an opportunity to prove herself; Lindsay brings Halstead as her date to her high school reunion.
"The Price We Pay": Voight's son may be involved with the Fitori murder case, intensifying tension between Antonio and Voight; Ruzek helps Burgess get retribution.
"Different Mistakes": Voight's new Internal Affairs handler proves to be suspicious of his actions; Voight must work with his former partner from the Gang Unit; Halsted enlists Jin to help him gather more information on Lonnie Rodiger; Olinsky takes Ruzek down a peg.
"A Material Witness": Burgess and Atwater come across a gunshot victim and the only witness is Olinsky's daughter; Ruzek goes to Burgess for help with an undercover mission.
"At Least It's Justice": Halstead's badge is revoked when Lonnie Rodiger is found dead; Severide (Taylor Kinney) and Clarke (Peter Mills) find Dr. Elliot's torso; Sumner (Sydney Tamiia Poitier) tries to prove herself; Lindsay shares a moment with Severide.