Daniel Kyri

The mattress factory fire spirals out of control. Truck and squad lay it on the line in hopes of getting the trapped victims out alive.

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.

Casey struggles to get Boden to sign off on a new recruit. Foster extends an olive branch to her irritating new medic. Otis inspires Herrmann to seek new partners at Molly's and Brett realises life in Fowlerton will take some getting used to.

Brett and Foster question the suspicious circumstances surrounding an attack at a juvenile detention centre. A convoluted new technology at Firehouse 51 tests everybody's patience and Kidd is chosen to represent the district at a leadership conference.

Kidd must prove herself at the National Firefighter Leadership Conference, while the rest of Firehouse 51 is called to two eerily similar car wrecks. Mouch tries to keep the firehouse informed by starting a newsletter and Cruz deals with a heartbreak.

Cruz and Severide suspect foul play when a fire started by an elderly woman turns deadly. Kidd, Foster and Brett create a women's-only lounge. Firehouse 51 celebrates some good news.