In responding to a call Atwater (LaRoyce Hawkins) and Burgess (Marina Squerciati) discover a gunshot victim and the only witness is Lexi Olinsky (guest star Alina Taber). The shooting is tied to a Latin gang. To protect Olinsky’s (Elias Koteas) daughter, Voight (Jason Beghe) takes the case from the Gang Unit.
Voight and the team discover a massacre, eight million in cash stolen and two wounded men in a clearing house. During questioning, one guy, Perko (guest star Dusan Faeger), provides some intel that is key to the case and leads Antonio to realize that two gangs were involved. Burgess steps up to help the unit and prove herself to Voight.
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).
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.
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 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.
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.
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.
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.
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.
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 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.
A murder in a Bulgarian neighborhood results in a challenging investigation when locals won't talk to police.
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.
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.
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 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.
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.
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.
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.
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.
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.
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.
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.
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.
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
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.
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).
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).
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.
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.
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.
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.
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 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.
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.
While investigating the murder of a teenage boy, Voight (Jason Beghe) finds a connection with the murder weapon - linking it to a case that he worked on 17 years ago. While the victim's father (guest star Philip Casnoff), a prominent defense attorney, tries to get the case taken over by Area Central Homicide, Voight digs back into the old case under the watchful eye of his former partner, Lieutenant Denny Woods (guest star Mykelti Williamson).
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.
After being tipped off about a woman running barefoot through the woods, Intelligence is led to a kidnapping victim locked up in a shipping container. The bizarre scenario leaves Voight (Jason Beghe) questioning the legitimacy of the case, and sends the team on a twisted trail to get to the bottom of it. Meanwhile, a former relationship of Halstead's (Jesse Lee Soffer) comes back into the picture, much to the surprise of Lindsay (Sophia Bush).
When Chicago's "Night Crawler" Bobby Trent (guest star Michael B. Woods) is murdered over a single piece of mysterious footage, Intelligence must investigate one of Chicago's wealthiest families -- uncovering a lineage of old money and secrets. Meanwhile, Burgess's (Marina Squerciati) sister Nicole (guest star Jules Willcox) arrives at the District for a visit, and presents an icy attitude towards Ruzek (Patrick John Flueger).
When a charred body is found in a torched house, Intelligence must work to identify the victim, as well as a young boy who is found badly injured inside. As they look to determine the cause and who may have been involved, they are faced with a web of secrets and lies. Meanwhile, Lindsay (Sophia Bush) and Halstead (Jesse Lee Soffer) receive an odd warning about Rixton (guest star Nick Wechsler) that leaves them suspicious.
When Lindsay (Sophia Bush) is tipped off about a grieving father looking to avenge his daughter's death, Olinsky (Elias Koteas) goes undercover as a hitman-for-hire. With Gang Intelligence lacking enough evidence to arrest the original gangbanger in question, the team works to reinvestigate the case. Meanwhile, Ruzek (Patrick John Flueger) comes back after finishing his undercover assignment only to have Voight (Jason Beghe) knock him down to patrol duty.
When a mutilated sex offender is found dead, it is unclear if he was the victim of a hate crime, sexual assault or self-mutilation. As Intelligence questions those related to the case, they find themselves up against a private "special police" force who may be covering up illegal activities. Meanwhile, Halstead (Jesse Lee Soffer) runs Jimmy's (guest star Tony Crane) DNA to confirm that he is actually Lindsay's (Sophia Bush) father.
When a young officer is shot dead in the lobby of an apartment building, Intelligence looks to the latest known offenders who have threatened the police. But when a second officer is killed, the team finds that they are dealing with someone who is highly trained and knowledgeable. Voight (Jason Beghe) works to keep the case contained as they deal with Chicago's ever-present war against the police. Meanwhile, Lindsay (Sophia Bush) confronts Antonio (Jon Seda) about his new job with the State's Attorney.
Severide (guest star Taylor Kinney) is brought into the District for questioning after his car is found to have caused a deadly crash. As the investigation gets underway, the team works to uncover a group of car-jackers who may be the key to Severide's innocence. Meanwhile, Voight (Jason Beghe) pairs Burgess (Marina Squerciati) with Olinsky (Elias Koteas), who has a hard time feigning his excitement about this new partnership, and Lindsay (Sophia Bush) considers meeting her estranged father who is now out of prison.
After receiving a complaint from a frustrated neighbor, Burgess (Marina Squerciati) and Officer Sorensen (guest star Kevin Kane) arrive to the house of baseball player Jake McCoy (guest star Billy Burke), and find the dead body of a 16-year-old girl, Maya Collins (guest star Violett Beane). There is conflict within the case as Intelligence learns that Olinsky (Elias Koteas) and McCoy are friends, and McCoy admits that he was helping Maya and other girls try to escape the sex trade. Meanwhile, Burgess and Sorensen track down a thief who turns out to be a cop with a rocky past, and Lindsay (Sophia Bush) gets a mysterious flower delivery that may be tied to her past.
When a call comes in reporting a car being stripped, Burgess (Marina Squerciati) and Tay (guest star Li Jun Li) respond and discover a badly beaten young man and his fiancé missing. Fearing a public relations nightmare Voight (Jason Beghe) and the team are on their best behavior as they search for answers and the missing woman. At the same time, Lindsay (Sophia Bush) surprises Halsted (Jesse Lee Soffer) with a big question. Commander Fogel (guest star Ian Bedford) berates Platt for going over his head to have Tay assigned to District 21. Also starring Jon Seda, Patrick John Flueger, Elias Koteas, LaRoyce Hawkins and Amy Morton. Guest starring Brian Tee, Samuel Hunt, Barbara Eve Harris and Sam Straley.
When Platt (Amy Morton) goes to her father Robert's (guest star Chelcie Ross) house for dinner, she warns him to be careful with his new girlfriend Natalie (guest star Lilia Vassileva). Following dinner, Platt is physically assaulted as she's getting into her car and is rushed to Chicago Med. Voight (Jason Beghe), Lindsay (Sophia Bush) and Halstead (Jesse Lee Soffer) arrive at the hospital to investigate, and a concerned Mouch (guest star Christian Stolte) finds himself being questioned. Meanwhile, Antonio (Jon Seda) leads the rest of Intelligence at the scene as they look into previous threats against Platt, but his attention shifts when he is called into Robert's townhouse and finds signs of an even more gruesome attack on Platt's father. Also starring Antonio Dawson, Patrick Flueger, Elias Koteas, Marina Squerciati, and LaRoyce Hawkins. Guest starring Marlyne Barrett, Colin Donnell, Barbara Eve Harris and Gideon Emery.
While responding to a call of shots fired at a family residence, Lindsay (Sophia Bush) and Halstead (Jesse Lee Soffer) discover the only survivor is the youngest daughter who is traumatized. While Lindsay and Dr. Charles (guest star Oliver Platt) evaluate the girl and see if she can help identify the killer, Antonio (Jon Seda) and Olinsky (Elias Koteas) look into a pyramid scheme "self-help" group for potential suspects. Meanwhile, Platt (Amy Morton) tries to make the case to Commander Crowley (guest star Barbara Eve Harris) for Burgess (Marina Squerciati) and Roman (Brian Geraghty) to remain partners.
When the team finds the body of a widowed, single-mother in the trunk of her car, they are shocked to discover that the victim was in constant contact with Voight's (Jason Beghe) now-reformed son, Justin (guest star Josh Segarra). After Lindsay (Sophia Bush) and Voight find Justin has been attacked in the same manor and is critically injured, Antonio (Jon Seda) and the team know that Voight will be out for revenge. Meanwhile, Roman (Brian Geraghty) makes a difficult decision and Commander Crowley (guest star Barbara Eve Harris) has plans to make changes within the unit.
While responding to a call of shots fired, Voight (Jason Beghe), Antonio (Jon Seda), Halstead (Jesse Lee Soffer) and the team come across a secret battered woman's shelter and discover the owner has been wounded and a resident of the shelter has been kidnapped. The team faces a challenge as the gunman is still at large and the identities of the women are kept confidential. Meanwhile, Burgess (Marina Squerciati) and Roman (Brian Geraghty) go undercover to track down a man robbing people by catfishing them on a dating app and Lindsay (Sophia Bush) opens up to Halstead about her past.
When a call comes in about a woman stabbing a man then fleeing the scene, Burgess (Marina Squerciati) and Lindsay (Sophia Bush) go investigate and find a young woman with the weapon in her hand. The suspect turns out to be a victim and she tells Olinsky (Elias Koteas) that she was held hostage for months and her kidnapper attempted to psychologically manipulate her into forgetting her identity while he physically abused her. The team sets out to find the woman's abductor before he can harm anyone else. Meanwhile, tensions are high at the station when Ruzek (Patrick John Flueger) accuses Roman (Brian Geraghty) of having feelings for Burgess.
While working at a sobriety checkpoint, Burgess (Marina Squerciati) finds a duffel bag full of heroin in the truck of a respected college professor who claims to know nothing about how the drugs ended up there. Voight (Jason Beghe) decides to hold off on charging the unlikely suspect and Olinksy (Elias Koteas) and Antonio (Jon Seda) follow up on a lead to see who is behind the drug smuggling. At District, Roman (Brian Geraghty) expresses his desires to become a Field Training Office to Platt (Amy Morton) and Mouse (guest star Samuel Hunt) sets Halstead (Jesse Lee Soffer) up with an off-duty security job working for the attractive owner of a medical marijuana clinic.
When a young boy is executed, Intelligence turn to the boy's parents for information and upon further investigation, discover the father has a criminal background and was a part of a local gang. After another shooting in gang territory, this time nonfatal, Lindsay (Sophia Bush) and Halstead (Jesse Lee Soffer) speak to the victim's mother to see if the two crimes are related and Mouse (guest star Samuel Hunt) works to find a connection. To honor the deceased young victim, Antonio (Jon Seda), Platt (Amy Morton), Roman (Brian Geraghty), Burguess (Marina Squerciati), Mouse and a number of other CPD officers and members of the community come together for a candlelight vigil.
Voight (Jason Beghe) convinces Deputy Crowley (guest star Barbara Eve Harris) to bring in his former cellmate, Eddie Little (guest star Clancy Brown), as a CI for the unit in order to help bring down a big-time cocaine supplier and his local dealers. Antonio (Jon Seda) is skeptical of this decision but Voight puts him at ease when he opens up about his time in prison with Little. Meanwhile, Burgess (Marina Squerciati) makes a difficult decision regarding her relationship with Ruzek (Patrick Flueger) and Roman (Brian Geraghty) devises a plan to help fund Platt (Amy Morton) and Mouch's (guest star Christian Stolte) wedding with the help of Firehouse 51
Lindsay (Sophia Bush) goes undercover in an effort to track down a rogue police officer targeting women leaving a local casino. When Detective Martin Watts (guest star Erik Jensen), who oversees all cases out of the casino, gets word of the investigation he becomes involved much to Voight's (Jason Beghe) dismay. After recent events, Burgess (Marina Squerciati) sets plans in motion to transfer Districts pending Platt's (Amy Morton) approval and Mouse (guest star Samuel Hunt) attempts to lift Ruzek's (Patrick Flueger) spirits by offering to set him up with a friend. Meanwhile, Antonio (Jon Seda) volunteers to take Roman's (Brian Geraghty) place in the upcoming boxing match against Jimmy (guest star Steven R. McQueen) from Firehouse 51.
When the decapitated body of a woman found in Lake Michigan is connected to Voight's (Jason Beghe) social circle, Lindsay (Sophia Bush) fears his relationship with the group may hinder his ability to approach the case objectively. Roman (Brian Geraghty) is having a hard time coping with recent events and an error in judgment causes him to make a grave mistake. Meanwhile, Olinsky (Elias Koteas) becomes upset when Antonio (Jon Seda) doesn't consultant him before making a decision that could affect Michelle's (guest star Madison McLaughlin) future.
A doctor with personal connections to Voight (Jason Beghe) is under investigation when four of his patients are committed to Chicago Med after an overdose of chemo. The doctor denies Lindsey (Sophia Bush) and Halstead (Jesse Lee Sofer) access to his files, but after obtaining a warrant the team is able to track down his patients and discover all of them have been poisoned with unnecessary chemo. Meanwhile, Burgess (Marina Squerciati) and Platt (Amy Morton) work together to clear Roman's (Brian Geraghty) name.
A suspicious person call turns into a murder investigation when Burgess (Marina Squerciati) and her temporary partner Price (guest star Travis A. Knight) discover the body of a dead man in an SUV. After Mouse (guest star Samuel Hunt) identifies the victim as the owner of a security company, the unit soon realizes there might be more to his story. Meanwhile, Roman (Brian Geraghty) takes Andrew (guest star Vincent Shuster) out for a memorable daytrip and Platt (Amy Morton) offers Ruzek (Patrick Flueger) some assistance. Halstead (Jesse Lee Soffer) and Lindsay (Sophia Bush) take a step forward in their relationship.
ntelligence sets out to find a missing teenaged boy who they believe poses a serious threat to the students at his wealthy school after finding disturbing drawings in his notebook. Meanwhile, Atwater (LaRoyce Hawkins) is eager to make a good impression on a prominent African American police Captain (guest star Eamonn Walker) and Olinsky (Elias Koteas) and Michelle (guest star Madison McLaughlin) find themselves in a difficult situation and turn to Ruzek (Patrick Flueger) and Burgess (Marina Squerciati) for help.
While Platt tries to manage a chaotic desk area, a man struggling to get her attention takes a drastic action and demands that the unit find his missing daughter. At the same time, Commander Fischer (guest star Kevin J. O'Connor) informs Voight that Bunny (guest star Markie Post) is bringing up new accusations on a case from his past. Lindsay urges her mother to fix the situation. Meanwhile, Antonio is shocked to learn a secret Olinksy has been keeping.
After surviving a hit against him, Voight is convinced the culprit is a criminal he and Olinksy once put away and is determined to catch him before he injures anyone else. At District, Atwater accidentally spills information about Ruzek's past which unsettles Burgess and Platt assigns Burgess and Roman a high society dog-napping case.