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 as Boden's grand plans take a detour.
The firehouse pulls together to help Dawson retake the firefighters' exam; the station welcomes a new squad member; Shay receives an uninvited guest; Boden makes a bold move.
A massive explosion sends Chicago into chaos - and 51 to the rescue.
Firehouse 51 struggles to cope after the tragic death of Rebecca Jones; Severide performs one final gesture for Bloom; Boden seeks to reconnect with Donna.
Jones fights to stay on at Firehouse 51 while Dawson and Shay take a girls' weekend at 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 everyone with a motive from Firehouse 51.
With Keeler a free man, Severide grows impatient and takes matters into his own hands. Meanwhile, Jones struggles to fit in as the new candidate at 51.
Severide and Chicago P.D. hunt for Katie while Dawson faces the final test of her training.
Firehouse 51 steps in when a blackout causes chaos during a frigid night in Chicago.
Casey continues to deny his lingering injuries; Shay receives stunning news about Darryl's suicide; Dawson struggles to keep a damning secret.
Dawson faces an uphill battle - and unlikely competition - as a new recruit at the academy. Meanwhile, Casey discovers a lingering injury and Mills receives life-changing news.
On the verge of closure, Firehouse 51 bands together in a fight to save the station.
Dawson and Casey's romance escalates while Shay hits rock bottom and goes MIA.
A drive-by shooting forces Cruz to make a big decision while Casey and Dawson struggle to keep their feelings at bay.
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