A fire at a boarding school leaves Lt. Severide (Taylor Kinney) shaken and wondering if he could have done more. Meanwhile, with the firehouse in full support of Dawson (Monica Raymund) as she retakes the fireman’s exam, Lt. Casey (Jesse...

In the season finale, a boarding school fire leaves Severide shaken as Boden's grand plans take a detour.

With everyone's support, Dawson makes final preparations to retake the fireman's exam, but a call to the field may throw a major wrench into her plans. Elsewhere, Lt. Casey has an important matter to discuss with Antonio. Meanwhile, Lt. ...

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.

Lt. Casey (Jesse Spencer) and Dawson (Monica Raymund) volunteer to help at a charity run at Chicago Medical when a massive explosion sends Chicago into chaos. With one of their own missing in the blast, the firehouse is tested like never...

A massive explosion sends Chicago into chaos - and 51 to the rescue.