The members of Firehouse 51 struggle to cope when one of their own dies in a fire, while lieutenants Casey and Severide blame each other for the tragedy.
Severide hides his serious shoulder injury as he tries to rescue a construction worker from a collapsed building; two teens become trapped in a vehicle.
Casey must decide whether or not to turn in a dirty cop's son who paralysed a teen in a drunken-driving accident; new girl Nicki pays Severide special attention.
Chief Boden comes under fire when the press blame him for the death of a homeless man, while Shay has a nasty run-in with her ex.
Casey faces the consequences of confronting Detective Voight; Dawson's career hangs in the balance after her questionable conduct on a call.
Detective Voight plays with fire to get Lieutenant Casey to retract his statement; paramedic Dawson receives help from a girl she saved.
Taylor Kinney
Kelly Severide
Eamonn Walker
Chief Wallace Boden
David Eigenberg
Christopher Herrmann
Joe Minoso
Joe Cruz
Christian Stolte
Randy "Mouch" McHolland