Firehouse 51 is pushed into crisis by chronic understaffing, budget cuts, and politically driven restructuring. City “brownouts” take rigs and entire houses offline with little warning, forcing 51 to cover more ground with fewer resources and longer, more dangerous shifts. These pressures expose cracks across the department, from delayed police and EMS responses to exhaustion-related accidents, including a serious ambulance crash that highlights the human cost of relentless call volume. Leadership tensions rise as City Hall quietly advances battalion consolidations, placing increased responsibility on company officers and reshaping command structures within the CFD.
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Episode 1
Kicking Down Doors
A new face at Firehouse 51 causes tension, while rising chaos in the city brings new challenges to the team. Herrmann stalls on plans of relinquishing his office to Mouch.
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Episode 2
Primary Search
Vasquez fights to prove himself at 51. Violet and Novak pursue a troubling mystery. Herrmann is on a quest to keep Molly's profitable.
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Episode 3
All in the Blood
When city budget cuts stretch crews thin, Pascal takes matters into his own hands. Vasquez looks to an old friend for help. An incident in the field hits close to…
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Episode 4
Mercy
Firehouse 51 must band together after a devastating fire catches them off guard. Vasquez continues his quest for answers. Violet and Novak face an unexpected roadblock in the new training…
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Episode 5
Ghosts
Cruz hunts for the identity of an unknown ally. Mouch takes steps to help a friend. Vasquez must make a difficult choice.
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Episode 6
Broken Things
A traffic jam forces Violet and Novak to take drastic measures to save a patient. Severide shadows Pascal for a day. Kidd goes the extra mile for Isaiah.
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Episode 7
Pierce the Vein
Severide investigates a suspicious high school fire. Novak gets an unexpected call. Violet brings a 51 firefighter onboard the ambulance for a shift.
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Episode 8
A Man Possessed
When an act of arson harms someone close to the Firehouse 51 family, Severide must track down the perpetrator. Impending budget cuts push Mouch and Pascal to get creative.
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Episode 9
Crime of Passion
A member of the Firehouse 51 family remains in peril. Cruz lends a hand to Severide in the ongoing investigation.
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Episode 10
Carry a Torch
Novak explores a new romantic connection. Vasquez deals with the aftermath of his father's recent release.
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Episode 11
Frostbite Blue
Herrmann grows uneasy when a local accident attorney inserts himself into a routine call. Firehouse 51 gets a visitor.
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Episode 12
Coming in Hot
Pascal finds himself under intense scrutiny when a member of the firehouse is injured on a call. Herrmann grapples with family issues.
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Episode 13
Reckoning (I)
Firehouse 51 is called to an airfield when a passenger jet goes silent mid-air, triggering a high-stakes emergency and cracking open a bigger mystery that could put countless lives in…
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Episode 14
Hit and Run
Severide is on high alert to track down a reckless driver who puts one of their own in harm's way. A member of Firehouse 51 struggles with a potentially life-changing…
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Episode 15
Do Not Resuscitate
A car crash puzzles Kidd and Vasquez. Herrmann gets his chance in the spotlight. Violet and Novak deal with a moral dilemma.
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Episode 16
Firehouse 66
Severide is forced to overcome obstacles at the firehouse. Cruz finds himself at a loss amid the new changes in his family.
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Episode 17
Sway
After a devastating fire erupts at a surgery center, Kidd works to hunt down the true cause. Violet, Novak and Vasquez grapple with shifting relationships. Molly's hosts its first trivia…
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Episode 18
Instinct
While in the field, Violet and Novak are thrust into a dangerous and rapidly escalating situation, forcing them to rely on their instincts to protect both themselves and a vulnerable…
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Episode 19
Exit Point
Severide investigates a fire at an abandoned store inhabited by squatters. Mouch pens a memoir about his life.
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Episode 20
Speak of the Devil
Severide is forced to crack open a cold case buried for decades. A routine call hits too close to home for Novak.
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Episode 21
Thank You
Severide and Kidd welcome a surprise visitor. Herrmann and Cindy renew their vows. Mouch receives some encouraging news.