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23 Episodes 2015 - 2016
Season 4 of the cop drama find the men and women of the Intelligence Unit tackling an array of tough cases, including some that intersect with their personal lives. A member of Voight's social circle, for instance, may be involved in the death of a stripper; the doctor suspected in a chemotherapy-overdose case treated Voight's late wife; and, in a crossover episode with Law & Order: Special Victims Unit, a man who murdered a friend of Lindsay's escapes a New York prison and heads to the Windy City. Among the other cases: the death of a man who may be connected to the CIA; the kidnapping of women from a secret shelter; the murder of a 6-year-old African-American child; and the fatal shooting of a possible innocent bystander.
Episode 1
Wed, Sep 30, 2015 60 mins
In the Season 3 premiere, a detective is abducted by a heroin kingpin; Lindsay's downward spiral continues; Olinsky confides in Platt about a secret from his past; and Roman shares his worries with Burgess about her impending marriage to Ruzek.
Episode 2
Wed, Oct 7, 2015 60 mins
The team investigates the death of an 8-year-old boy. In other events, Burgess tells Ruzek about Roman's odd behaviour; and Bunny may derail Voight's career.
Episode 3
Wed, Oct 14, 2015 60 mins
A man whose daughter is missing takes a member of the team hostage. In other events, Voight learns that Bunny has made new accusations regarding an old case; and Antonio is shocked by a secret that Olinksy has been keeping.
Episode 4
Wed, Oct 21, 2015 60 mins
Voight and Olinksy hunt an ex-con who's targeting cops; Atwater accidentally reveals information about Ruzek's past that unsettles Burgess; and Platt tasks Burgess and Roman with handling a high-society dognapping case.
Episode 5
Wed, Oct 28, 2015 60 mins
Ruzek's career is in jeopardy when an undercover mission doesn't go as planned.
Episode 6
Wed, Oct 28, 2015 60 mins
The discovery of a body in an SUV is investigated.
Episode 7
Wed, Nov 4, 2015 60 mins
The team searches for a teenager who may pose a danger to his classmates at an affluent school; Atwater hopes to make a good impression on a prominent African-American police captain; and Olinsky and Michelle turn to Ruzek and Burgess for help when they find themselves in a sticky situation.
Episode 8
Wed, Nov 11, 2015 60 mins
The team discovers the mutilated body of a government official while responding to an informant's tip about an upcoming drug trade. In other events, Burgess helps plan a surprise for Platt.
Episode 9
Wed, Nov 18, 2015 60 mins
A decapitated body found in Lake Michigan is linked to Voight's social circle; Roman makes a grave mistake; and Olinsky is upset when Antonio doesn't consult him before making a decision that could impact Michelle's future.
Episode 10
Wed, Jan 6, 2016 60 mins
A doctor with a link to Voight is investigated when four of his patients are committed to Chicago Med following chemo overdoses; and Burgess and Platt work together to clear Roman's name.
Episode 11
Wed, Jan 13, 2016 60 mins
A burglary-sexual assault at a luxury condo is investigated; and Lindsay, Halstead, Atwater and Ruzek go undercover in an attempt to catch the perpetrators. In other events, Voight tries to help a former acquaintance; and Platt and Mouch receive disappointing news about their upcoming wedding.
Episode 12
Wed, Jan 20, 2016 60 mins
Voight arranges for his former cellmate, Eddie Little, to be a CI in an effort to bring down a major cocaine supplier; Burgess makes a major move regarding her relationship with Ruzek; and Roman develops a plan to help fund Platt and Mouch's wedding.
Episode 13
Wed, Feb 3, 2016 60 mins
Lindsay goes undercover in order to catch a cop who's targeting women leaving a local casino; Burgess plans to transfer districts; Mouse offers to set Ruzek up with a friend; and Antonio volunteers to take Roman's place in a boxing match against Jimmy from Firehouse 51.
Episode 14
Wed, Feb 10, 2016 60 mins
The team hunts an infamous criminal who escaped from a New York prison and committed a triple homicide in Chicago. Joining them in the investigation: NYPD SVU detectives Benson (Mariska Hargitay) and Fin (Ice-T).
Episode 15
Wed, Feb 17, 2016 60 mins
Burgess stops a college professor with a duffel bag full of heroin at a sobriety checkpoint; Roman tells Platt of his desire to become a field training officer; and Mouse arranges a security job for Halstead at a medical marijuana clinic.
Episode 16
Wed, Feb 24, 2016 60 mins
The execution-style murder of a young boy is investigated. The incident, which may be tied to another shooting, leads CPD officers and community members to come together for a candlelight vigil.
Episode 17
Wed, Mar 2, 2016 60 mins
While on a bank run for his off-duty job at the dispensary, Halstead and his co-workers becomes involved in a shootout with a violent robbery crew. Later, Voight and Lindsay learn that the dispensary's owner has faced threats from local gangs angry that she's cut into their business; and the team follows a lead to a potential suspect.
Episode 18
Wed, Mar 23, 2016 60 mins
The team investigates a shooting and kidnapping at a secret woman's shelter; Burgess and Roman go undercover in an attempt to catch a robber who's using a dating app to set up his victims; and Lindsay tells Halstead about her past.
Episode 19
Wed, Mar 30, 2016 60 mins
The team searches for a suspect who held a woman for months and, while physically abusing her, attempted to psychologically manipulate her into forgetting her identity. In other events, Ruzek accuses Roman of having feelings for Burgess.
Episode 20
Wed, May 4, 2016 60 mins
The team investigates when an abandoned newborn baby is found dead. In other events, Voight is surprised to learn that his son is in town; and Burgess and Roman grow closer.
Episode 21
Wed, May 11, 2016 60 mins
Burgess gives chase after Roman is wounded by a hooded perp who opened fire on their patrol car and shoots who she thinks is the suspect, but no gun is found at the scene—and the person she shot is a 17-year-old honour student.
Episode 22
Wed, May 18, 2016 60 mins
Lindsay and Halstead respond to a shots fired call and discover one survivor: a young girl. In other events, Antonio and Olinsky investigate a "self help" group; and Platt makes the case to Crowley for why Burgess and Roman should remain partners.
Episode 23
Wed, May 25, 2016 60 mins
In the Season 3 finale, the team investigates the murder of a single mom who was in contact with Voight's now-reformed son, who was himself brutally assaulted. Meanwhile, Roman makes a major decision; and Crowley plans to make changes within the unit.