All The Dark. A hazmat call at a dialysis center leads to a shocking discovery. Boden clashes with Paramedic Chief Robinson. Carver is concerned about Gibson's behavior.
Something About Her. Severide, Kidd and Van Meter investigate a fire at a recording studio. Kylie helps James keep a secret from Boden. Mouch tries to keep boundaries with a client.
Port In The Storm. Some familiar faces return to Firehouse 51, and Brett says goodbye. Violet scrambles to decorate for Brett's wedding. A call at the expo center turns shocking.
Red Flag. Violet clashes with her new partner. Severide discovers a stash of money on a call and faces off against the cops working the case. Mouch gets a parking ticket.
On The Hook. Brett and Violet's defibrillator malfunctions on a call. Herrmann tries to find the perfect home for his new recliner. A secret from Gibson's past comes out.