NBC’s One Chicago is airing its first crossover in five years tonight. Here’s how to watch the epic event featuring "Chicago Fire," 'Chicago Med," and "Chicago P.D.."

One Chicago has a lot of characters and storylines to keep track of. It would be a disservice to the flow of a good crossover is every single person was accounted for, which means that some of them are going to have to sacrifice screen time for the greater good.

The long-awaited One Chicago crossover is nearly here in the 2025 TV schedule, and the storyline on January 29 is epic enough that one star expects fans to "go bananas" when they see it. Chicago Fire will air before Chicago Med for the event in a time slot switch,