Following Voight's suspension, Antonio becomes responsible of intelligence to handle the heroin outbreak.
Intelligence is going after the man responsible for the apartment building fire.
The team sets out to save a teenage girl who was abducted by thieves.
Burgess has to choose between following Voight's advice or a possible new ally.
Ruzek finds out that his dad works for a suspected drug dealer, and is compelled to investigate whether his father was involved.
When the wife of an alderman is beaten to death, Voight is pressured by Brennan to close the case.
When the leader of a local mosque becomes a suspect in the bombing of an Army recruitment center, Voight asks Halstead to remain neutral.
As the team attempts to arrest a drug dealer, Atwater is faced with a difficult choice.
Antonio goes too far which puts the entire team in danger.
Voight and Ruzek are trying to deal with the repercussions of Antonio's situation, and they must help in order to solve a case.
The Intelligence Division is at loggerheads with a mayoral candidate over the investigation into the fatal shooting of a prominent local lawyer.
While pursuing a heroin supplier, the team has a confrontation with a recently paroled convicted felon.
Trying to catch the head of a long-time criminal enterprise, Atwater becomes embroiled in a situation that puts his loyalty as well as his conscience to the test.
Upton and Burgess have to deal with a tough situation when intelligence finds the location of a weapons cache.
The team uses Cruz's information to hunt down a team of robbers.
Voight and the team focus on investigating the disappearance of a dancer under mysterious circumstances.
Following the shooting of a mayoral candidate by an unknown sniper, the team races against time to track down the perpetrator.
Voight and Ray Price have to do their best to put an end to gang violence.
The team investigates the murder of Burgess' boyfriend, but everyone discovers mysterious facts about everything.
A group of criminals steal medicine trucks, and the team must work together to catch them.
Antonio struggles to bring down a major drug dealer, while Voight takes it upon himself to protect the team.
The team tries to stop Kelton from becoming mayor, and Voight must lead them on one last attempt.