: While on a routine assignment to check condemned buildings, Chief Boden and Kelly Severide discover a man with dementia living in a derelict home. The man only repeats a series of numbers— 24198 —which Boden eventually realizes is a police badge number. This discovery leads to a poignant connection with Boden’s own late father, who was also a police officer.

: Gallo performs a daring rescue at a construction explosion site, saving one of their own. Where to Watch Legally

: The "will-they-won't-they" tension between Matthew Casey and Sylvie Brett continues. Both characters meet potential new love interests following an accident: Casey is charmed by a victim named Sydney , while Brett interacts with a fellow firefighter named Greg Granger .