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 takes matters into his own hands.
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.
The actor chats up the Season 2 finale, Boden's big romance - and a true story about Jesse Spencer.
In a touching ceremony, Chief Boden and Donna get married at Firehouse 51.
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.
Sound mixer Blair Scheller talks about miking a house fire and isolating dialogue.
Chicago Fire arrives on a scene to put out a stove fire, but find the person responsible in a bizarre location and position.
Taylor Kinney praises Top Dog winner Smokey, stresses fire safety and chats about Season 3.
With his family's restaurant up in flames, Mills risks his life - and those of others - to save an important item.
Boden refuses to surrender his vulnerable firehouse.
David Eigenberg and Eamonn Walker answer fan questions from Twitter.
Charlie talks about how its like shooting a movie.
Leslie checks on Kelly.
A dinner between friends takes a romantic turn with Dawson and Mills.
Stairs collapse during a rescue attempt and land Severide in serious danger.
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