Spoilers ahead for Episode 10 of Chicago Fire Season 13, called "Chaos Theory." The Chicago Fire team wasn't kidding with the title of "Chaos Theory" for the latest episode in the 2025 TV schedule, because one character went through some serious highs and lows before making a decision that may have cut him from the upcoming One Chicago crossover event.

The One Chicago crossover has released its first footage. Fans of Chicago Med, Chicago Fire, and Chicago P.D. are in for a treat. This is the first time since 2019 that a full three-show crossover has happened with the Chicago shows.

NBC's three One Chicago shows are coming together for the first time in five years on Jan. 29 The first One Chicago crossover event in five years is finally here — and it looks, well, terrifying! In an exclusive first look at the Jan.