The firefighters respond to a blaze at a local prison, but a power outage and a prison riot creates a recipe for disaster.
Casey teams up with members of the Chicago Police Department to uncover the mystery surrounding Hallie's murder.
Severide decides to attack his assault accusations head on, and tragedy befalls Firehouse 51 when the squad loses one of their own.
Old friends and enemies return to haunt Firehouse 51, for better and for worse.
Mills' ambition to join Squad sparks a firestorm of animosity in Firehouse 51.
A local gang terrorizes Firehouse 51.
As the squad tracks down a serial arsonist, Severide's father ignites tensions at Firehouse 51.
The return of Severide's father rekindles tensions with Chief Boden; Shay decides that she wants a baby, and Mills and Dawson make their relationship public.
Tensions continue to mount at Firehouse 51 as Cruz's erratic behavior escalates; Severide tries to reconnect with his ex-fiance, and Shay is forced to make a tough decision.
Casey struggles to rekindle his relationship with his mother, while Severide attempts to make amends with his ex-fiance, and Dawson dives into the Chicago underground in search of her brother's shooter.
Tensions rise when Severide crosses paths with someone from his past. Dawson lets Shay in on her secret affair, while Shay and Clarice juggle some problems of their own.
Firehouse 51 is rocked by the events that lead to a surprising death. Meanwhile, Severide makes an unexpected move towards his future.
While Severide confronts his shoulder problems head on, Casey must make an unexpected new commitment as his mother'' parole hearing nears.
Emotions run high at the station when a horrific accident hospitalizes one of their own. Meanwhile, Casey is forced to juggle two family dramas - his own and Cruz's.
Casey's men are accused of looting a fire scene. Meanwhile, Dawson invites Casey to her cousin's fancy Christmas party, and a frustrated Shay reaches her limit with Severide.
Vargas is forced to leave his position due to medical issues, and things finally heat up between Casey and Dawson. Meanwhile, the Chief continues to investigate the potential firebug, Ernie.
Executive Producer and Director Joe Chappelle talks Chicago Fire, Chicago PD, and shooting a large-scale action scene in the middle of Chicago.
Herrmann and Cruz have some fun while filming the sewer rescue scene in "Let Her Go."
The firefighters respond to a fire at a local prison, but a power outage and a prison riot creates a recipe for disaster.
Otis helps Herrmann out of a tough situation.
Chicago Fire's Monica Raymund and Lauren German have a musical take on sublingual injections.
Chicago Fire cast and crew offer up lesser known fire truck facts.
Casey agrees to participate in a sting operation to catch Hallie's murderer, but when the plan goes haywire, Casey finds himself in the clutches of a ruthless killer.
Otis, Herrmann, Mouch and Cruz talk about Chicago cops vs. Chicago firefighters.
Are you Team Casey or Team Severide?