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Casey has to decide if he should report that a cop's son is responsible for a drunk car accident that left a teen paralyzed. Meanwhile Severide is diagnosed with a fractured vertebra and Mills has trouble sharing his time between his mother and the job.
When Dawson faces suspension the girl she saved decides to help her. Detective Voight does everything he can to make Casey retract his statement. A dangerous action during an apartment fire may change Casey's situation.
Chief Boden takes action to try to help a boy who was seen at two fires previouly, one firefighter is on medical leave after an accident at a fire and Casey and Dawson are gradually seeing each other.
Severide's injury gets worse, an abusive mother makes terrible decision and a train accident takes life of a young person.
Severide seeks an old friend's help with his injury, a disciplinary action is taken against Dawson and Casey has to deal with the aftermath of opposing Detective Voight.
Thanksgiving at the firehouse includes a 10-car pileup, a gang shooting, and a meth lab.
An elderly woman needs Severide's help, Detective Voight tries to persuade Casey not to testify against his son, Chief Boden is accused of leaving a homeless man to die in a warehouse fire and Shay comes face to face with a man from her past during a call.
The members of Firehouse 51 struggle to cope when one of their own dies in a fire. Lt. Matthew Casey and
Lt. Kelly Severide blame each other for their friend's death. Meanwhile Casey goes through a separation with Hallie and
Battalion Chief Wallace Boden has to make a crucial decision.
Lt. Kelly Severide tries to keep his shoulder injury a secret as he helps a construction worker from a collapsed building. Meanwhile two teenagers are stuck in a vehicle.
Severide feels compelled to help a man he saved from a car accident. Casey and Boden struggle to deal with the orders from Jones' father. A call to duty affects the firehouse.
Cruz needs to make a choice after the result of the death of a young girl in a drive by shooting. Meanwhile there is a lot of sexual tension between Casey and Dawson and they try very hard to not act on it. Shay resigns from station 51.
The firehouse crew rally around each other after their recent loss, but will they come closer together, or will this break them apart? The Chief gets some BIG news.
Severide's old friend arrives, hoping for a second chance with the Chicago Fire Department. Meanwhile, Mills tries to regain his active squad status, Mouch confronts his fear about meeting his child, and Brett and Dawson set out to have a big night out.
Jones is struggling with her Dad's choice to transfer her to PR. Dawson & Shay go away for a break but find their skills are needed. The boys help Mouch with his dating skills.
Severide (Taylor Kinney) feels sidelined as he leaves Detective Lindsay (guest star Sophia Bush) and the Intelligence Unit to do their job and locate his sister Katie (guest star Brittany Curran). Shay (Lauren German) gets an unusual tip from Chicago Blackhawk players Brent Seabrook and Duncan Keith, who makes friends with Clarke (guest star Jeff Hephner) and stop by Molly's. Meanwhile, Casey (Jesse Spencer) learns more about his head injuries after another close call and Dawson (Monica Raymund) pushes hard to pass the physical test at the Academy.moreless
There's a new chief at 51 while Chief Boden takes leave, and he brings with him a relieving firefighter who none expects they would every work with. The new chief's methods of leadership are quite different than the crews at 51 are used to ...
Leslie Shay's sister visits to get some closure on her Shay's death and the investigation into her arson continues