Brett and Mackey find their lives in peril. Casey and Brett tread in unfamiliar territory. Severide chases a memory while Kidd adeptly solves a firehouse problem. Ritter ...

As Firehouse 51 welcomes a new member to the team, whose presence could provide some complications, Brett's leadership shines during a scary call; Boden sees great potent ...

Brett and Foster question the suspicious circumstances surrounding an attack at a juvenile detention center. A convoluted new technology at Firehouse 51 tests everybody's ...

Casey struggles to get Boden to sign off on an energetic new recruit. Foster extends an olive branch to her irritating new medic. Otis inspires Herrmann to seek new partn ...

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. ...

Casey investigates the cause of a trailer park fire; Boden reaches his breaking point; Mouch, Herrmann and Cruz wonder why Molly's isn't living up to expectations. ...

A series of explosions hit Chicago; Herrmann adjusts to his new duties; Kidd is visited by an old friend. ...

Boden becomes skeptical of Gorsch's motives; Severide gets involved in a difficult situation following a child's rescue from a car wreck; Foster is tasked with giving Cru ...

A raging fire consumes a 15-story apartment building complex, trapping victims on the top floors. ...

Casey struggles with his personal life; the firehouse welcomes a new member; Boden clashes with the new assistant deputy commissioner. ...

Boden's chances for a promotion are met with potential complications, leading him to take matters into his own hands. Dawson and Casey don't see eye to eye on an importan ...

Boden takes a big step in the pursuit of a major career decision. Kidd becomes increasingly distrustful of Renee's motives with Severide. Herrmann has trouble bouncing ba ...

Severide is surprised when Renee Royce returns to the firehouse; Casey helps Chief Boden in his latest pursuit; Kidd regrets a decision regarding Severide; Herrmann disag ...

Boden and Severide receive a surprise package after saving a girl from a car accident. ...

Casey grows skeptical of Cordova when a large amount of money turns up missing at the property of Mexican drug cartel. ...

Casey and Severide assist the FBI with an undercover mission; Kidd tries to help Severide come to terms with recent developments. ...

Boden has a lapse in judgment in the aftermath of rescuing a young boy. Kidd struggles to win the approval of Severide's mom after a surprise visit and Otis takes on new ...

The members of Firehouse 51 come to terms with one of their own being injured and deal with the temporary replacement. ...

Otis and Kidd respond to a call involving a residential fire only to head into danger when gunfire goes off in the house. ...

A domineering husband answers for his injured wife after Casey and Dawson respond to a car accident. ...

The firefighters help the police track down a bombing suspect. ...

The photographer whose pictures of Casey and Severide during a rescue make the front page of the newspaper chronicles a day-in-the-life story at the Firehouse. ...

After responding to a time-sensitive rescue, Casey and Severide don't see eye to eye on the best course of action. Herrmann struggles to entertain his daughter on bring y ...

Dawson and Casey do everything they can to locate Bria's whereabouts after discovering important new information. Lt. Severide reunites with Chief Grissom, an old family ...

After learning unsettling news, Dawson enlists Severide to help her out. Elsewhere, Casey and Dawson struggle with communication issues while Brett and Kidd compete to wi ...

After saving a young girl, Dawson is forced to make a tough decision when she finds out the girl's father is addicted to painkillers. Herrmann loses his cool and gets int ...

Brett attempts to make a lifesaving decision in the field to someone near and dear to the firehouse family. In an effort to impress Lily, Otis scrambles to get everything ...

Kidd is surprised to discover she is being transferred out of the firehouse; Severide and Casey are suspicious and investigate; Otis and Herrmann discuss taking over a ru ...

Casey and Severide find themselves at odds after Casey argues with him over the best way to save a teenager entangled in barbed wire. When Casey looks to Boden for help s ...

While running a secret errand, Dawson finds herself trapped in a collapsed parking structure; pressure mounts on Casey as he begins taking on additional duties; Kidd grow ...

Lt. Casey gets off on the wrong foot with Sam Mullins, a temporary Chief who is filling in for Boden at House 51 for the morning. When Casey later makes a risky move in a ...

After learning the school fire wasn't an accident, Chief Boden turns up the pressure on Severide and Casey to investigate the cause of the fire that trapped his wife. Fue ...