Firehouse 51 scrambles to save lives during a helicopter disaster.
Herrmann pushes Dawson to the limit while Casey faces down his corrupt brother-in-law.
Casey must deal with the fallout from his sister's divorce while Brett weighs a move back to Indiana.
Severide confronts his demons in an unexpected way while Dawson and Mills struggle with their new roles.
Tempers flare after a tragic collision between two fire trucks - and Cruz may pay the price.
Severide returns to Firehouse 51 still reeling from the loss of Shay; Dawson struggles with her new truck assignment; Mills learns more about his father's family; Cruz and Mouch pitch Molly's Two to Herrmann.
In the Season 3 premiere, Boden forces Firehouse 51 to pull themselves together in the aftermath of a tragic explosion.
For the tough-minded leader of the Intelligence Unit, there's a gray area between right and wrong.
In the season finale, a boarding school fire leaves Severide shaken, and Boden's grand plans take a detour.
The firehouse pulls together to help Dawson retake the firefighter's exam.
In the first hour of a crossover event with Chicago P.D., the firehouse is tested like never before when a massive explosion sends Chicago into chaos.
Firehouse 51 struggles to cope after the tragic death of candidate Rebecca Jones.
Jones fights to stay on at 51 while Dawson and Shay take a girls' weekend to a remote cabin.
A father's heroic sacrifice affects the entire squad - and leads to an unexpected threat.
Keeler's disappearance ignites an investigation into Firehouse 51.
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