The One Chicago universe pulled off the unthinkable: integrating over 20 characters into one thrilling and coherent storyline. In a three-hour event involving Chicago PD, Fire, and Med, the writers achieved a resounding success with the crossover on NBC,

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.

The first One Chicago crossover in five years provided fans with plenty of non-stop action, heart-stopping moments and some fun (but strange) pairings between characters we'd never really seen interact all that much.

The series Chicago P.D, Chicago Fire, and Chicago Med have captured the attention and hearts of millions of viewers worldwide. However, it's not all action and drama, as the deaths of several characters have left indelible scars on the fans.