What I Saw – 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.
It Wasn’t About Hockey – 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.
The Plunge – 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.
Make This Right – The firehouse is called to a motorcycle crash, but 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.
You Choose – 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.
Inside These Walls – 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
Always a Catch – 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.
The Solution to Everything – Firehouse 51 is called in to battle a dangerous structure fire that places everyone in peril. Severide makes a big personal realization. Casey lends another helping hand to Naomi, the investigative reporter.
What Will Define You – 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.
All the Proof – Halloween is in full effect for Foster and Brett, who are summoned to a home where a prank has quickly turned serious. Gorsch continues his reign of terror on Firehouse 51.