Ralph Rodriguez

The Firehouse 51 crew have their work cut out for them when a tornado hits the city. Also, Brett must report Chilli after she makes a big mistake.

A member of Firehouse 51 becomes the victim of a vicious attack, and Brett and Jimmy worry about Chilli's behaviour.

Chief Boden finds himself in hot water when he misreads a neighbour's intentions. Severide receives a visit from his father.

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.

Herrmann must make a tough decision, and Casey tries to keep a tornado shelter open. Meanwhile, Brett and Dawson feel the effects of their actions.