Melissa Ponzio

When the squad is summoned to the scene of an accident, Chief Boden makes a split-second decision that overrides a fellow Chief.

Former bartender Roxy LeBlanc moves her family to her new husband's army post in Charleston, South Carolina. How will the tough Alabaman go down with the other military spouses?

Chief Boden makes a risky, last-minute decision in order to save the squad trapped in a burning warehouse.

A series of teen opioid overdoses sees Severide partner with Sean Roman, but he begins to suspect there's more to the story than his old friend is telling him. Casey tries to be there for Brett as she considers her birth mother's offer to meet.

Patterson steps in as chief, and Dawson becomes a target of the conspiracy. Also, an act of violence changes Firehouse 51 forever.

Patterson questions Boden's ability to lead the firehouse as the trial approaches; Brett and Chili find an unconscious man in a garden; Otis tries to fill his social calendar.