Chicago P.D.

Stepping Stone. When District 21 goes after a Colombian drug gang following a series of brutal slayings, an asset in the investigation emerges.

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.

Turn the Light Off. Dueling gangs are suspected when a massacre occurs and 8 million is stolen, Platt asks Ruzek for help.

830PM. As Voight and his team search for the bombers, they realize there might be more bombs set to detonate, Burgess niece fights for her life.

My Way. Cmdr. Perry notifies the unit that Pulpo has been released to help with a case, Ruzek gets difficult news, when a bit of Lindsay's past resurfaces, Voight reminds her how far she's come.

The Docks. Platt and Voight discuss their pasts, Jin uses a scapegoat when he is caught tinkering with Voight's computer, Lindsay realizes she needs to come clean.

A Beatuiful Friendship. Atwater settles into his new role, Lindsay turns to Voight for help, Jin is confronted about his meetings with Stillwell.