The team transport the victims of a terrible chemical leak to Chicago Med, where a bad situation quickly turns seriously worse.

Firehouse 51 responds to the scene of a harrowing blaze that endangers the lives of many, including one of the Chicago family.

A rare but deadly bacteria takes its toll on numerous victims around the city, leaving Chicago's finest first responders to work together alongside the CDC to resolve the dangerous situation. Severide suspects something bigger is happening.

As Casey and Dawson try to find harmony at home, Louie's father throws a wrench into their family plans.

Det. Pryma's case comes to an explosive end with Kidd and Carver's lives in danger. Brett installs an infant Safe Surrender Box at 51. Violet is determined to take Emma down.

Dawson and Casey deal with a very unsettling possibility, while Severide receives an offer from an infamous party guy.

An airfield emergency triggers a deeper mystery involving a passenger plane, propelling the Intelligence Unit into a high‑stakes pursuit of the culprit, all under the sharp eye of the FBI.

Firehouse 51 is called to an airfield when a passenger jet goes silent mid-air, triggering a high-stakes emergency and cracking open a bigger mystery that could put countless lives in jeopardy.

A traffic jam forces Violet and Novak to take drastic measures to save a patient. Severide shadows Pascal for a day. Kidd goes the extra mile for Isaiah.