Voight teams up with an unlikely ally to take a killer off the streets while fighting to bring his Intelligence unit back together.

The Intelligence Unit is in a race against time when a man from Torres' neighborhood is violently abducted.

A murder near Burgess and Ruzek's neighborhood leads the team to probe complex relationships in their close community.

A string of violent robberies across the city digs up one family's secrets; a surprising detail of Voight's past resurfaces.

After a bombing in downtown Chicago, Atwater meets up with a former friend from his academy days.

Torres is dragged into a deadly conspiracy when a routine assignment takes a violent turn.

When a violent break-in occurs, Voight's suspicions lead the team back to a disturbing figure from a past investigation.

Voight and the team race to solve the Bell case to prevent further deaths.

Platt faces trouble after a basic favor for an ex-recruit turns into a catastrophic situation.

Torres probes the Morgan case conspiracy, pulling Intelligence into a complex maze of hidden truths.

Kevin goes undercover to investigate the world of car jacking.

Details about Imani's past emerge as the Intelligence Unit seeks the truth behind the sudden resurfacing of a decades-old missing child case.d

An airport crisis reveals a larger conspiracy tied to a passenger jet, launching the Intelligence Unit into a dangerous chase for the suspect while the FBI watches closely.

Burgess mentors a new officer while the team works on a dangerous drug investigation.

Ruzek becomes suspicious after a DEA agent reaches out to him asking about a missing informant.

Torres works to end a revenge killing cycle after a teen's death.

Tensions between Voight and Imani begin to form when a series of ATM robberies hits the city.

A fatal house party prompts the Intelligence Unit to discover a family's disturbing secret. Atwater reaches a crucial personal crossroads.

Ruzek examines a VHS tape from his father's possessions, leading to unforeseen results.