Anthony Ferraris

Kidd and Severide's honeymoon is interrupted by a dangerous person from their past; Kidd's former academy classmate joins Firehouse 51; Brett and Violet reflect on their relationships.

Severide steps in as ranking officer at 51; Kidd fights to save her Girls on Fire programme; Cruz's family is threatened when someone from Javi's past resurfaces.

Boden makes a decision that impacts the race for deputy commissioner; a tense call brings up painful memories for Carver and Damon; Mouch struggles to adjust to the new truck.

A hazmat call at a dialysis centre leads to a shocking discovery; Boden clashes with Paramedic Chief Robinson; Carver notices a concerning change in Gibson's behaviour.

Severide, Kidd and Van Meter investigate a fire at a recording studio; Kylie helps James keep a secret from Boden; Mouch struggles to maintain boundaries with a paramedicine client.

Boden pushes his team to pull it together in the aftermath of the explosion; Casey works to track down a missing Severide; Newhouse brings news about one of Mills' relatives; Herrmann and Otis come up with new goals.