KPPX-DT Dawson turns to an unlikely source for assistance as she tries to help her brother; Severide does a favor for Lt. Whaley; Herrmann and Otis make tough discoveries about their silent partner. 2026-09-28 Cruz puts himself and his fellow firefighters in danger; Casey tries to resolve issues with his sister and mother; the team assists the bomb squad with a dangerous call. 2026-09-28 When Severide's father (Treat Williams) visits, he clashes with Chief Boden over a former colleague's death; Shay makes a decision about Clarice; the mystery about Herrmann, Otis and Dawson's bar is revealed. 2026-09-28 Mills questions Benny about the fire that killed Mills' father; Casey, Severide and Bennie investigate two mysterious diner fires. 2026-09-28 A failed rescue attempt deeply affects the men and women of firehouse 51; Dawson and Shay deal with a junkie's crazy behavior during a call; the team upsets local drug dealers. 2026-09-28 A paramedic candidate joins Shay and Dawson for a few shifts; Cindy Herrmann experiences pregnancy complications while her husband is out of town; Casey receives an unexpected visit. 2026-09-29