Voight (Jason Beghe) and Antonio (Jon Seda) enlist the help of agents at the Special Victims Unit in New York, Fin (guest star Ice T) and Rollins (guest star Kelli Giddish), to help track down the culprit of a series of rape/murders. Burgess (Marina Squerciati) has an opportunity to prove herself to Intelligence. Elsewhere Lindsay (Sophia Bush) enlists the help of Halstead (Jesse Lee Sopher) to act as her date for her high school reunion to get back at an old rival.
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).
More is learned about Halstead’s (Jesse Lee Soffer) dislike of the Rodiger family and it’s family relationships all around as Olinsky (Elias Koteas) shows a paternal side with his daughter Lexi (guest star Alina Taber) in an attempt to protect her and as Voight’s (Jason Beghe) trying to help his son who has recently been released from jail. Meanwhile the Intelligence Unit investigates a counterfeiting operation after discovering some high end cloth-like paper.
Atwater (LaRoyce Hawkins) and Burgess (Marina Squerciati) are given a new patrol car, but are challenged with keeping it brand new. A run in with a psychotic woman leads the Intelligence Unit to discover a drug smuggling operation which has put several girl’s lives in peril. Voight’s (Jason Beghe) overprotective act with Lindsay (Sophia Bush) leads her right where he doesn’t want as she also helps to keep Justin out of trouble.
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) and team head to a house that’s been associated with a number of top gangs. Events at the search result in Ruzek (Patrick Flueger), being encouraged to seek some counseling which may have lasting repercussions professionally and personally. Meanwhile Halstead’s (Jesse Lee Soffer) temper rises when he comes in contact with some unwelcomed people from his past.
Atwater goes undercover to take down a gun-trafficking ring, but discovers an officer from his past is undercover in the same organization.
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.
Intelligence does everything they can to build a case against the elusive leader of a drug ring, but things get complicated when Rojas realizes someone she cares about might be involved.
The clock is on after Ruzek witnesses a woman's kidnapping and the team races to put the pieces together. Burgess tries to connect with Ruzek outside of work but he mysteriously distances himself from her.
An armed robbery case quickly turns into a homicide investigation. When one suspect’s background suggests domestic violence, Upton is forced to reckon with her childhood. Voight and Halstead butt heads over Halstead’s righteous instinct.
Voight enlists the help of a reformed gang member to get a key witness' testimony in a murder case. More lives are put on the line as a gang war brews.
A homeless man's murder leads Intelligence to a criminal who has evaded capture for years. Rojas has a troubling experience with a young mentally ill man.
Intelligence searches for the dealer who caused multiple overdoses and is connected to Roman's missing sister. The case becomes a homicide investigation when they find the dealer's dead body. Guest star: Brian Geraghty.
Voight makes a deal with Darius Walker to help bring down a rogue group of dirty cops dealing drugs that were supposed to be destroyed. Upton clashes with Voight and enacts her own form of justice.
After receiving a 911 call about a possible domestic dispute, Burgess follows up with the location of the call with Platt and they find a murder victim. Later on, the Intelligence unit discovers that the killer is wanted by the FBI in six states for creating a sex trafficking ring. Burgess is injured while saving the victim who made the 911 call to her, and she loses the baby.
As they await news of Halstead’s fate, the team tries to focus on work, turning their attention to an illegal arms dealer. Atwater discovers his brother, Jordan, is back in Chicago and could be tied to the case. Voight faces the tricky task of how to deal with Halstead’s shooter. Burgess finally makes her decision.
Ruzek and Burgess’s secret begins to have severe implications for their police work. A series of deadly acts of vandalism causes tensions to run high in the insular neighborhood of Canaryville. Atwater tries to reach out to his brother, but only pushes him further away.
After injuring herself while pursuing a suspect, Burgess receives a shocking diagnosis. A homicide case turns into a missing persons case, with a sinister twist. Voight has to decide between justice and the letter of the law.
The Intelligence unit races against the clock to find Halstead, who has been kidnapped by thugs along with a woman who a link to a mistake by Halstead which resulted in a death. Meanwhile, Burgess considers options with her pregnancy.
The shocking murder of young boys affects Halstead. Crawford encourages Intelligence to use a new facial-recognition software to help identify a suspect, but the plan backfires.
Voight pulls Darius in after Crawford asks Intelligence to investigate a dangerous drug, but there is little trust in the relationship. When their plan to nail a dealer goes awry and another CI is murdered, the team must make a tough decision about Darius.
After zeroing in on the suspect responsible for the bioterrorism that’s gripping Chicago, the PD prepares to undertake their biggest manhunt yet. Upton is torn between helping track down the perp and providing emotional support to the scared young girl that needs her. Voight fears his team is being sent on a wild goose chase.
A murder in a Bulgarian neighborhood results in a challenging investigation when locals won't talk to police.
When Atwater goes undercover in a dangerous South Side drug syndicate, he learns there may be more to its kingpin than meets the eye. Halstead tries to join Atwater undercover, but finds himself at a disadvantage. Voight petitions the brass to show Ruzek leniency in his court case.
After a botched carjacking turns out to be something much bigger, Voight’s unit goes toe-to-toe with a smart drug kingpin who only works with women. New recruit Vanessa Rojas struggles with the transition from undercover to Intelligence, but the new case gives her a chance to play to her strengths.
With Kelton's election all but assured, Voight and his team must go off-book in a last-ditch effort to save Intelligence from getting axed.
When Kelton is found murdered, Voight’s grudge against the mayor-elect puts him under suspicion. Upton and Halstead are eager to prove their sergeant’s innocence, but the more evidence they gather, the closer they come to doing the opposite. After making bail, Ruzek searches for a missing Antonio.
A violent crew is hitting pharmaceutical delivery trucks and stealing drugs, but their motivation is more complicated than just money; the case tests Upton and Ruzek's relationship.
Antonio struggles with his guilty conscience as he tries to take down a major drug dealer; Voight takes a shot at Kelton to protect his team.
With the threat of a gang war looming, Voight and Ray Price must organize a peace summit to end the bloodshed before more innocent people get hurt. Meanwhile, Burgess evaluates her future with Blair.
Intelligence's investigation into the murder of Burgess' boyfriend threatens to reveal a dark side she was unaware of; the real motivation for his murder uncovers a much more unsettling truth.
Voight and the Intelligence Unit focus all their effort and resources into investigating the disappearance of an exotic dancer who served as a long-time criminal informant for their team.
A mayoral candidate is shot by an unidentified sniper, and CPD races to catch the shooter before he can take out his next target.
The team travels to a Wisconsin gun show to take down a supplier who’s manufacturing “cop killer” machine guns. Before going undercover together, Burgess (Marina Squerciati) discovers that Upton (Tracy Spiridakos) is dating Ruzek (Patrick John Flueger).
Using information from Chicago Fire's Cruz, Intelligence chases down the robbery crew that’s been using the lockbox key. Voight (Jason Beghe) is under pressure to bring the crew to justice without tarnishing the reputation of a murdered firefighter who might have been involved.
Intelligence crosses with a mayoral candidate while investigating the fatal shooting of a well-known defense attorney, and Antonio returns to work but questions his own judgment when an operation goes sideways.
While chasing a heroin supplier, CPD crosses paths with a convicted criminal recently released on a technicality. Halstead’s (Jesse Lee Soffer) history with the man threatens the team’s ability to put him back in prison.
In an attempt to dig himself out of a hole and save someone close to him, Antonio (Jon Seda) crosses a line that puts the entire team at risk.
Voight and Ruzek lock horns over how to handle the aftermath of the Antonio situation. Meanwhile, a series of violent carjackings turns deadly, and Ruzek must rely on a C.I. he grew up with to help solve the case.
Intelligence suspects the leader of a local mosque is behind the bombing of an Army recruitment station. After a second explosion, Voight (Jason Beghe) urges Halstead (Jesse Lee Soffer) to follow the facts and not let his time in the service cloud his judgment.
While CPD tries to take down a drug kingpin, Atwater (LaRoyce Hawkins) faces a tough choice between doing what’s required to solve the murder of a young dealer and what’s best for the community.
While undercover, Ruzek (Patrick John Flueger) discovers his father (guest star Jack Coleman) is working for a suspected drug dealer and is forced to ask the question: is his dad involved?
The wife of an alderman is beaten to death, and Voight (Jason Beghe) is under pressure from First Deputy Superintendent Brennan (guest star Anne Heche) to close the case. To elicit a confession, Upton (Tracy Spiridakos) tells a dark story about her childhood.
Politics get in the way as the team tries to rescue a teenage girl kidnapped by a robbery crew. Voight (Jason Beghe) and Platt (Amy Morton) try to exonerate Olinsky
A ride along goes sideways, and Burgess (Marina Squerciati) is faced with a difficult choice: follow the advice of Voight (Jason Beghe), or a potential new ally.
Bad heroin is causing overdoses in Chicago, and Intelligence is a man down with Voight (Jason Beghe) suspended. Antonio (Jon Seda) takes charge, but Ruzek (Patrick John Flueger) undermines his authority.
After discovering the true cause of the high-rise fire, Intelligence races to find the man responsible. And for Halstead (Jesse Lee Soffer), it's personal.
After Voight (Jason Beghe) witnesses the kidnapping of a young woman with a mysterious connection to his past, Intelligence works to find a connection between her kidnapping and several bank robberies. Ruzek (Patrick John Flueger) gets a tip that a grand jury has been summoned, putting Olinsky (Elias Koteas) one step closer to standing trial for Bingham’s murder.
Halstead (Jesse Lee Soffer) and Atwater (LaRoyce Hawkins) go undercover to prevent military-grade weapons from hitting the street. Meanwhile, Voight (Jason Beghe) calls in a favor as a last-ditch effort to clear Olinsky’s (Elias Koteas) name for Bingham’s murder.
Upton (Tracy Spiridakos) brings back an old undercover identity to help take down a meth ring spearheaded by a former criminal contact. And with pressure from Woods (guest star Mykelti Williamson) mounting, Voight (Jason Beghe) calls in a favor for Olinksy (Elias Koteas).
A string of stash house robberies lead back to an unlikely individual. Voight (Jason Beghe) confronts a key witness in the Bingham investigation.
Intelligence investigates a string of bombings targeting members of the media. Racing against a ticking clock, the team enlists Firehouse 51 to help examine the devices and prevent the next attack.
When a prominent Alderman known for his urban revitalization efforts is killed, Intelligence looks into the corruption haunting his neighborhood. Meanwhile Olinsky (Elias Koteas) feels pressure after receiving an ultimatum from Woods (guest star Mykelti Williamson).
Antonio (Jon Seda) finds himself getting close to the Salvadoran Detective, Marcella Gomez (guest star Sofia Lama), only to learn she has a hidden motive for being in Chicago. Meanwhile, Voight (Jason Beghe) learns that the body of his son's killer has been found.
Intelligence tracks down a vigilante attacking rapists. The investigation hits home for Burgess (Marina Squerciati), who begins to question if the men who raped her sister truly paid for their actions.
While trying to find the pimp, Intelligence stumbles on the women's shelter where he's scouting out girls. And Burgess (Marina Squerciati) moves the case forward with a series of confidential tips, but risks putting her informant in harm's way.
When Atwater (LaRoyce Hawkins) disappears at the house of a convicted felon, the evidence doesn't look promising - with his belongings and his blood left behind. Intelligence rallies to rescue him before it's too late. And Atwater struggles for survival faced with not only his captor but also a difficult connection to his past.
The death of Judge Tommy Wells' (guest star John Pankow) daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it. Meanwhile, Voight (Jason Beghe) discovers who's been leaking information from the 21st.
Halstead's (Jesse Lee Soffer) partying with Camila (guest star Anabelle Acosta) unintentionally puts him in the middle of a drug-related homicide. He's forced to choose between loyalty to his unit and his girl. Meanwhile, Voight (Jason Beghe) finally discovers the mole in his unit.
In the wake of several gang-related child abductions, Intelligence must race against time to find a kidnapped boy. Owing to their swiftness and military precision, the team scours the VA records and tracks the suspects to a former Army Ranger. With his previous experience as a Ranger, Halstead (Jesse Lee Soffer) convinces Voight (Jason Beghe) to send him undercover to try and get information from inside.
One of Voight's (Jason Beghe) friends, Congressman Scott Graynor (guest star Scott Bryce) is found passed out in his hotel room with a dead Ukranian girl. When Intelligence discovers the murder is connected to a sting and Burgess' (Marina Squerciati) boyfriend (guest star Zach Appelman) is working with the Feds, Burgess must choose between compromising her case or her boyfriend's case.
When Intelligence busts a meth lab run by gang leader Marshall Carter (guest star Aaron Roman Weiner), they uncover a re-homing scam in which children adopted from foreign countries are abandoned, then sold online. Meanwhile, Atwater (LaRoyce Hawkins) struggles with the difficult decision about whether to move his siblings Jordan (guest star Kylen Davis) and Vinessa (guest star Bobbi MacKenzie) to a safer environment outside of Chicago.
A picture perfect family is shot dead in their home and the team goes in search of a drug dealer with a likely connection. Voight (Jason Beghe) asks for the help of Vice Sergeant Sean McGrady (guest star Wil Traval) who has an old beef with Upton (Tracy Spiridakos). When McGrady turns up dead during the investigation, the case takes an unlikely turn.
When a young Latina woman is brutally murdered, Intelligence suspects she may have been working as a drug mule. With Antonio (Jon Seda) leading the case, the team's investigation takes them into the grim world of meat processing, and the discovery that there may be a different motive behind her death.
While investigating a drug-related homicide, Intelligence is stonewalled by the 'no-snitch' culture of the neighborhood. And Atwater (LaRoyce Hawkins) discovers a personal connection to the case. Meanwhile, the police's own code of silence is put to the test when Upton (Tracy Spiridakos) is asked about Ruzek's (Patrick John Flueger) rough altercation with a suspect.
When Lindsay (Sophia Bush) receives a panicked call from her mother Bunny (guest star Markie Post) whose boyfriend had just been shot, Lindsay must figure out the best way to approach the situation, as her mother is now a murder suspect. The case opens up when a group of high school students OD, and the drugs in question relate back to the situation with Bunny. In addition to her mother's issues, Lindsay finds herself up against the review board dealing with consequences of her actions.
After a van explodes during a Chicago street festival, a Muslim patrol officer Frank Toma (guest star Ben Youcef) goes missing and evidence quickly piles up pointing to his involvement. Burgess (Marina Squerciati) - who helped train Toma - is desperate to prove his innocence, even if that means going against her superiors.
When the team is called to an in-progress bank robbery, they come across Detective Hailey Upton (guest star Tracy Spiridakos) trying to take over the crime scene with her Robbery-Homicide unit - butting heads with Voight (Jason Beghe) in the process. As the robberies continue to be executed around the city, Lindsay (Sophia Bush) is forced to make a decision in the heat of the moment, revealing a surprising suspect behind the mask. While working on the case at the district, Upton is shocked to come across Platt (Amy Morton), who has a special connection to her past.
A live video is streamed online showcasing a tortured man being beaten and burned alive. Upon further investigation, the victim's identity is traced back to that of a man who had been previously locked up for statutory rape. When another attack of a similar nature occurs, Intelligence finds a connection between the crimes, suspected pedophiles, and group named the Perv Hunters. Meanwhile, Lindsay (Sophia Bush) runs into a few bumps in the road - both personally and professionally.