Ora Jones

Chief Boden leads the fight to keep the firehouse open, an emergency call to an apartment structure puts the squad in harm's way, and Dawson receives life-changing news.

Lt Casey must work with Voight and the Intelligence Unit, Shay grows increasingly excited about the prospect of motherhood, and everyone comes together to support the opening of Molly's.

Tragedy strikes when a rescue attempt at a tenement building proves unsuccessful, leaving the men and women of Firehouse 51 affected by the loss of the victim.

When the squad's rig breaks down in the field, Casey reunites with his old friend and colleague Jason Kannell from Squad 6.