The firefighters respond to a blaze at a local prison, but a power outage and a prison riot creates a recipe for disaster.

When a call comes in from the Cook County jail, the squad steps into a volatile predicament and are tasked with trying to defuse an escalating situation. Shay (Lauren German) remains hopeful about her baby dreams and Hermann’s (David Eig...

Events force Lieutenant Casey (Jesse Spencer) to team up with the Intelligence Unit, now run by Voight (guest star Jason Beghe), who doesn’t appear to have changed his crooked ways after his stint in prison. Shay’s (Lauren German) excite...

Casey teams up with members of the Chicago Police Department.

Severide decides to attack his assault accusations head on, and tragedy befalls Firehouse 51 when the squad loses one of their own.

A frustrated Severide (Taylor Kinney), turns to an unlikely ally to resolve his current dilemma. Casey (Jesse Spencer) begins to find satisfaction in his personal life, while Mills (Charlie Barnett) and Dawson (Monica Raymund) face perso...