Benson (Mariska Hargitay) has traveled into Chicago to help Voight (Jason Beghe) and intelligence with a rape/murder case that is frighteningly similar to a case from New York a decade ago. She calls in Fin (Ice-T) and Amaro (Danny Pino) to assist. The prime suspect, Yates (Dallas Roberts) is let go after rigorous questioning. He then requests a meeting with Lindsay (Sophia Bush) and he warns of unintended consequences from what intelligence is doing.
As District 21 is struggling to come to terms with the loss of one of the team they are forced to put their personal feelings aside when a café is bombed. The unit has several suspects and only one good eye-witness, who happens to be a minor. Halstead (Jesse Lee Soffer) pulls some strings to convince the mom to let him question Isabella (guest star Haley Seda) on what she saw. Atwater (LaRoyce Hawkins) finds himself in hot water when he makes a crucial mistake. Thanks to the tech savvy Mouse (guest star Samuel Hunt) the team is able to gain important intel that could help solve the case. Meanwhile Voight (Jason Beghe) helps Platt (Amy Morton) when she comes up against several roadblocks in an attempt to get a memorial stone for their fallen member.
Intelligence responds to a drug robbery gone wrong and in their investigation it’s revealed that the first person Voight (Jason Beghe) ever gave his card to is linked to a double murder. Voight will fight to keep her family safe. At the same time, we learn the real reason why Halstead’s (Jesse Lee Soffer) brother Will (guest star Nick Gehlfuss) came to Chicago. Meanwhile Desk Sgt. Platt (Amy Morton) takes care of a young girl at district.
When the father of one of the dead girls explains that he paid Dennis Lee (guest star Kelvin Han Yee) to have her brought to America, this hits home with Olinsky (Elias Koteas). Lee is one of the Chicago's most wanted fugitives and escaped Olinsky once before. Intelligence isn't about to let Lee dupe them again and Olinsky's past files prove valuable in finding Lee's whereabouts. Meanwhile, Sean Roman (Brian Geraghty) has an altercation with a fellow officer which lands him in a bit of trouble. At the same time Platt (Amy Morton) helps prepare Nadia (guest star Stella Maeve) to take her polygraph test after passing the CPD written exam.
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.
With a World Trade conference in Chicago, all members of intelligence are undercover in various protest groups to determine potential threats. Ruzek (Patrick Flueger), infiltrates the Black Grid group and befriends Sierra (guest star Lucy Blehar). When she ends up dead intelligence is suspicious of an Argentine Secretary, Fabian Sosa (guest star Gary Perez). Voight (Jason Beghe) and Olinsky (Elias Koteas) question Sosa about the death and the team enlists Mouse (guest star Caleb Hunt) to help with their tech needs in tracking Sosa. Meanwhile Halstead’s (Jesse Lee Soffer) brother, Dr. Will Halstead (guest star Nick Gehlfuss) shows up in town for an undetermined amount of time and is already stirring up trouble.
Bunny (guest star Markie Post) comes to Lindsay (Sophia Bush) concerned about a suspicious repeat customer at her husband’s rental company. This lead brings Intelligence into a case which robbery-homicide has been working for months. Detective Gina Gawronski (guest star Angelique Cabral) downloads their intel to the team, she also happens to be Antonio’s (Jon Seda) former co-worker from Vice. Voight (Jason Beghe) doesn’t trust Bunny’s motives for the tip.
With her recent decision to stay on the beat, Burgess (Marina Squerciati) begins to feel a little regret. While at a convenience store she sees some suspicious activity and pursues it without calling in for backup. Roman (Brian Geraghty) warns against it, but it’s too late, Chang (guest star Rich Ting) confiscates their guns and radios. They are
trapped with no means to communicate out for support. Meanwhile, it’s a slow day in intelligence and they are spending the day receiving taser certification.
During the investigation of a brutal home invasion leaving a mother and her daughter dead, all signs point to the father as the main suspect. Ruzek must work alongside his estranged patrolman father. Burgess and Roman get through their first shift back on the beat. Alex Manette, Bailey Chase, David Eigenberg, Patrick Mulvey, Mark Pellegrino guest. (Herrmann from CF)
Antonio (Jon Seda) and his sister Gabriela (guest star Monica Raymund) go to the office of Adrian Gish (guest star Robert Knepper), the man they believe started the fire that killed Shay. Intelligence along with patrol officers Burgess (Marina Squerciati) and Roman (Brian Geraghty) put pressure on Gish to try and make him confess. Lindsay (Sophia Bush) approaches Voight (Jason Beghe) about returning to Intelligence when she realizes that the task force isn’t what she thought it would be. At the same time Desk Sgt. Platt (Amy Morton) is acting strange and has everyone curious as to why she’s being overly cheery, friendly and nice. Also starring Jesse Lee Soffer, Patrick Flueger, Elias Koteas, and LaRoyce Hawkins. Eamonn Walker, Charlie Barnett and Markie Post guest star.
With Burgess (Marina Squerciati) in the hospital after suffering gunshot wounds, the intelligence team is determined to find the people responsible. Lindsay (Sophia Bush) delays her start so she can help with this case. Search of the house provides a lead and when a bomb is triggered a key suspect is found. Meanwhile the team takes turns watching over Burgess.
Intelligence is deputized by Lindsay's Task Force to help cripple a major Mexican drug cartel by bringing down their massive money smuggling ring. Burgess takes over Platt's desk on her first day back at work, and Roman deals with his guilt over Burgess' shooting. Halstead and Lindsay realize Voight's dating rules no longer apply to them. Raul Urbina, Kylie Rosales, David Lang guest.
While Antonio (Jon Seda) continues his off-duty security job for Asher (guest star Michael Park) and Layla (guest star India De Beaufort), Asher is killed. Voight (Jason Beghe) and Olinsky (Elias Koteas) make sure Antonio is covered. While they work the case Halstead (Jesse Lee Soffer) and Lindsay (Sophia Bush) go undercover in a rather uncomfortable location.
A friend of Nadia’s (Guest star Stella Maeve) leads the intelligence unit to a huge heroin bust. Unfortunately this bust results in Olinsky (Elias Koteas) arriving home to find the suspects are holding his wife (guest star Melissa Carlson). Voight (Jason Beghe) and the team think they’ve found a common thread with the suspects but it’s not who they think. Meanwhile Burgess (Marina Squerciati) and Roman (Brian Geraghty) are given an assignment where they get paired with a K-9 officer, Jenn Cassidy (guest star Spencer Grammer) who is Roman’s former partner and girlfriend.
Following the death of a 10-year old girl the intelligence unit have one option to gain access to their suspect, go on the inside. Ruzek (Patrick Flueger) and Atwater (LaRoyce Hawkins) act as inmates to work the case from the inside. Outside prison, Voight (Jason Beghe) and Olinsky (Elias Koteas) follow-up on a good lead to answer some questions about the shooting. Meanwhile, Burgess (Marina Squerciati) and Roman (Brian Geraghty) show three boys around district thinking they are part of the Police Explorers program, only to realize that’s not quite the case.
Two teenage girls have gone missing and the team know the clock is ticking to find them. Halstead (Jesse Lee Soffer), Antonio (Jon Seda) and Lindsay (Sophia Bush) investigate a tenement which gives them a much needed lead. Voight (Jason Beghe) brings the father of one of the girls to district in order to get some honest answers.
While trying to help out Olive (guest star Caroline Neff) Voight (Jason Beghe) is attacked and taken. When he doesn’t show for work the team gets suspicious and begin investigating. Ruzek (Patrick Flueger) and Atwater (LaRoyce Hawkins) prove they do belong on the team when they demonstrate smarts and savvy tracking down a lead that will hopefully bring them to Voight. Meanwhile Burgess (Marina Squerciati) and Roman (Brian Geraghty) are trying to track down a girl who has run off with a police badge.
Intelligence begins to look into a string of murders where the victims have a dollar bill pinned to their chests. Thanks to some digging by Ruzek (Patrick Flueger), Voight (Jason Beghe) learns his friend was involved in some shady business dealings. Antonio (Jon Seda) and Halstead (Jesse Lee Soffer) follow-up on some leads that help focus in on the culprit and motives for the murders.
The bounty on Halstead’s (Jesse Lee Soffer) head becomes a serious reality as an innocent bartender takes a bullet meant for him. Olinsky (Elias Koteas) tries to reason with Bembenek (guest star Jason Singer) to call off the hit, to no avail. Voight (Jason Beghe) and the team keep this investigation in-house to find the hired assassin. Meanwhile, after a tense interaction at district Platt (Amy Morton) and Nadia (guest star Stella Maeve) come to an understanding.
Atwater (LaRoyce Hawkins) is settling into his new gig on intelligence as Antonio (Jon Seda) is relegated to desk duty while recovering. Lindsay (Sophia Bush) finally realizes she has no way out and confides in Voight (Jason Beghe) for help. Meanwhile Jin (Archie Kao) is confronted about his secret meetings with Stillwell (guest star Ian Bohen).
As the Sheldon Jin murder investigation moves forward, Voight (Jason Beghe) is under close watch by Internal Affairs but he’s still in complete command of the intelligence unit. A routine undercover job becomes anything but when Voight’s SUV is T-boned while trailing an armored car carrying Ruzek (Patrick Flueger). At District, Burgess (Marina Squerciati) meets her new partner, Sean Roman (Brian Geraghty) and tension is high from the start.
Commander Perry (guest star Robert Ray Wisdom) notifies the Intelligence unit that Pulpo (guest star Arturo Del Puerto) has been released to help track down a dangerous cartel leader. This doesn’t sit well with our team as he kidnapped one of their own and no love is lost between sides. Meanwhile, Ruzek (Patrick John Flueger) gets some difficult news as a blast from Lindsay’s (Sophia Bush) past comes back, giving us a glimpse at where she came from.
As Antonio’s life is now in question, Voight and Platt (guest star Amy Morton) open up about their pasts. Jin 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 realizes she’s going to have to come clean about a few things.
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.
The Intelligence Unit works to find the bombers. Even with government agencies in the mix, Voight and his team work the case from their own angles and connections. Lindsay and Antonio question doctors who handled the transplant surgery for an Ambassador from Syria, but no clues emerge. Olinsky gets some solid intel and the team work from there. It’s a race against time as they realize there may be additional bombs targeted to detonate.
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 pulls Halstead’s badge when Lonnie Rodiger is found dead. After a car accident Severide (guest star Taylor Kinney) and Clarke (guest start Peter Mills) discover the torso of Dr. Elliot who has been instrumental in putting away high profile criminals. With Intelligence down one Sumner (guest star Sydney Tamiia Poitier) is given an opportunity to prove herself.
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) is assigned a new Internal Affairs handler, Stillwell (guest star Ian Bohen) who proves to be suspicious of Voight’s actions. During an investigation involving a gambling ring Voight is forced to work with his former partner from the Gang Unit, Shi (guest star Mark Dacascos). At the same time Halsted (Jesse Lee Soffer) remains fixated on Lonnie Rodiger (guest star Matthew Sherbach) and enlists Jin’s (Archie Kao) help to gather more information.
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.
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.
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.
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).
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.
Tensions run high as Intelligence seeks justice for Olinsky (Elias Koteas) after he's stabbed in prison. Antonio’s (Jon Seda) loyalty is put to the test and Woods (guest star Mykelti Williamson) looks to take down Voight (Jason Beghe) once and for all.
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.