Gerardo Davila

Firehouse 51 prepares for their semi-annual firehouse inspection. Brett fights to save her paramedicine program. Commander Martin Pearce asks Severide for a favor.

Michael races to find a hidden Whistler before Mahone; searching for clues outside the prison, Lincoln runs into an old friend and makes a new one: T-Bag slithers his way into Lechero's graces as the prisoners threaten a revolt due to the lack of agua (water).

In the explosive season finale, an unexpected engagement leads to a quickly planned wedding, causing suspicions that something is awry. Sutton encourages Emma to show Kristin what they found in Rebecca's (recurring guest star CHARISMA CARPENTER) house, and Ethan makes a discovery that changes the game. Meanwhile, a shocking revelation leads to major repercussions in the Mercer household.