Anthony Ferraris

The Firehouse 51 crew have their work cut out for them when a tornado hits the city. Also, Brett must report Chilli after she makes a big mistake.

A wave of threats hit Chicago, leaving Firehouse 51 in a desperate situation. Meanwhile, Chili's behaviour continues to cause concern.

Severide returns from Las Vegas with a life-changing secret to share. Plus, the crew make a disturbing discovery at the scene of a fire.

Boden pushes his team to pull it together in the aftermath of the explosion, Casey works to track down a missing Severide, Newhouse brings news about one of Mills' relatives and Herrmann and Otis come up with new goals.

Casey finds himself in dangerous territory when working undercover to bring down a trafficking ring. Also, Dawson realises that her life is about to change, and a new candidate makes an unusual first impression.

Severide springs into action when gunmen open fire on the subway. Gabby Dawson learns a harsh lesson on her first day as a firefighter.