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.
Firehouse 51 is thrust into the furnace with a train derailment.
Old friends and enemies return to haunt Firehouse 51, for better and worse.
As the firehouse staff deals with a tragedy, Dawson receives a suicide note and Severide looks into Bloom's past. Meanwhile, Chief Boden receives distressing news and asks Shay for help finding a crucial item.
Things heat up between Casey and Dawson during what seems to be a home-cooked dinner date. The question is, will they finally share a kiss?
The new girl at work has her sights set on Severide.
Led by Chicago P.D.'s Detective Lindsay, the station searches for a known criminal seeking revenge on Severide.
Special effects coordinator Joe Millinac explains Chicago Fire's biggest mechanical gag to date - a six-foot story car drop!
Joe talks about the location and the children being saved in this episode.
Charlie talks about how its like shooting a movie.
Michael talks about how big the set is.
Casey races against a raging fire to save himself - and a rescued baby - from certain death.
Dawson and Shay scramble to save a gunshot victim - and themselves - from the men who attempted to murder him.
When Casey and Dawson attend a swanky Christmas party, a little too much champagne leads to a bold move.
Forced to evacuate a burning warehouse, Mills must leave a victim behind.
Firehouse 51 arrives at the scene of a disaster.
Go behind the scenes of Leon's car crash with stuntman Dan Maldonado.
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