Chicago Fire

Severide and Kidd continue to investigate Benny’s old arson case, unexpected news leads Brett to ponder a big decision and all hell breaks loose.

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

Severide and Boden search to uncover whether arson was the cause of a fire at a hair salon. Mouch, Hermann, Otis and Kidd make a startling discovery in tracking down the missing piercing nozzle from Engine 27.

A serial arsonist cold case is reopened when Lieutenant Severide finds a connection to a recent salon fire. Firehouse 51 celebrates a retirement party.

Severide gets angry at Cruz when he feels his orders were disobeyed in the field. Boden reconnects with an old high school friend during a call to a house fire. Herrmann has issues when one of his favorite knick- knacks from Molly's goes missing.

A horrible storm wreaks havoc on Chicago and impacts Firehouse 51 when the power goes off. A little boy mysteriously shows up at the station and everyone works together to uncover who he belongs to and why he ended up there. Foster and Kidd argue about Severide.

During an emergency call, an unsuspecting Lieutenant Casey suddenly finds his life in peril. Grissom (guest star Gary Cole) warns the firehouse that they will need to gear up for a performance evaluation. Otis discovers he won a raffle prize at a recent fundraiser and Brett is met with challengers in her personal life.

Tensions run high between Casey and Herrmann after the firehouse responds to an apartment complex fire. After discovering something extremely suspicious during the call, Kidd and Severide do some investigating and get CPD on the case. Brett struggles to deal with her emotions while Herrmann's wife, Cindy, hopes to get her interior design business on track by taking a stab at redoing the common room.

Brett, Foster and Kidd take a road trip to Indiana for a getaway and encounter a bus accident involving a boy's hockey team that will leave them scrambling and relying on their instincts to save those hurt in the accident. The rest of Firehouse 51 competes in the annual Chili Cook-Off.

A spate of robberies comes to light after a firehouse lockbox key goes missing. CPD's Voight has suspicions that a firefighter may be involved, and with Boden's support he recruits Cruz to go undercover and help sniff out any suspicious activity.

When the firehouse is called to a motorcycle crash, Casey and Severide sense that the details don't add up and work to determine exactly what transpired. A rift develops between Mouch and Otis. Brett, Foster and Kidd work to secretly fix a dent in the ambulance bumper they believe they unknowingly caused.

Cruz leads the charge in getting the firehouse to gear up for the Polar Plunge. Herrmann has a hard time bouncing back after dealing with a tough call. Foster’s personal relationships begin to interfere with her job.

A dangerous situation leaves Casey and Naomi in peril. Foster and Brett are in charge of planning a field trip visit to the station while Severide and Kidd go through tough times.

Severide's side project of fixing the boat for a wealthy acquaintance turns complicated and personal. Meanwhile, his relationship with Kidd is at a crossroads. Brett helps Casey search for a new apartment and Firehouse 51 decides to enter Tuesday in a dog competition.

Severide lands in grave danger when Firehouse 51 battles a risky structure fire; Casey lends another helping hand to Naomi, the investigative reporter; Herrmann, Mouch, Otis and Cruz search for a tantalizing memento from Boden's past.

Stakes are high when a massive car pile-up on the freeway impacts someone dear to the firehouse family. Brett and Foster encounter a harrowing call while Kidd and Severide find their relationship being tested.

Gorsch continues his reign of terror at Firehouse 51, taking over Boden's morning meeting, and going out on calls in Boden's place. Meanwhile, Brett and Foster respond to a call where a Halloween prank has turned deadly serious.

Severide faces some major adversity and Kidd is on a mission to help in any way she can. Following a car accident rescue involving a teenage girl and her young sister, a suspicious Brett has an unsettling feeling there is more to the story than what appears on the surface.

Firehouse 51 is on high alert when a series of explosions rock the city. Herrmann adjusts to his new duties and Kidd gets a visit from an old friend.

Working alongside a journalist, Casey does some digging into the cause of a trailer park fire. Boden hits his breaking point while Mouch, Herrmann and Cruz work to figure out why Molly's isn't performing up to expectations.

Firehouse 51 is faced with a daunting challenge when an out-of-control blaze consumes a 15-story apartment complex, trapping victims on the top floors. Complicating the rapidly escalating situation, members soon discover that someone close to home may be one of the trapped victims.

Chief Boden becomes increasingly skeptical of Assistant Deputy Commissioner Gorsch's motives, while Severide gets wrapped up in a difficult situation following the rescue of a child from a car wreck. Trying to fit in with the rest of the firehouse, Foster is tasked with doling out some personal advice to Cruz.

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 important decision, while Kidd finds herself struggling to find time with Severide. Brett and Dawson respond to a tough call that quickly turns dangerous.

Casey tries to deal with his unsettled personal life and the firehouse welcomes a new member. Boden clashes with new Assistant Deputy Commissioner Jerry Gorsch (guest star Steven Boyer).

Lt. Severide is shocked when Rene Royce (guest star Sarah Shahi) resurfaces at the firehouse. Casey comes up with a plan to help Chief Boden in his latest pursuit. Kidd regrets a decision she made regarding Severide. Herrmann doesn't see eye-to-eye with Lt. Colannino (guest star Andy John Kalkounos) over coaching their son's basketball team.

Boden takes a big step in the pursuit of a major career decision. Kidd becomes increasingly distrustful of Renee's (guest star Sarah Shahi) motives with Severide. Herrmann has trouble bouncing back after a tragedy.

After responding to a residential fire at a property belonging to a Mexican drug cartel, Casey is skeptical of Cordova (guest star Damon Dayoub) after a hefty amount of money was found missing from the crime scene. Elsewhere, Kidd makes a big decision.

After saving a girl from a car accident, Chief Boden and Lt. Severide are taken aback when they receive a surprise package. Brett struggles to keep quiet about Cruz reacquainting with his now-married high school sweetheart and Otis tackles his next challenge. A crisis brings Bria (guest star Quinn Cooke) back into Dawson's life.

Boden has a lapse in judgment in the aftermath of rescuing a young boy. Kidd struggles to win the approval of Severide's mom (guest star Kim Delaney) after a surprise visit and Otis takes on new responsibilities at the firehouse.

When the FBI takes over Firehouse 51 for an undercover mission, Casey and Severide volunteer to assist with the investigation. Kidd attempts to help Severide come to terms with recent developments he's been managing.