It's been five years since the last three-part Chicago Fire, Med, and P.D. crossover. This one did not disappoint.

After a five-year gap, the NBC dramas “Chicago Fire,” “Chicago Med,” and “Chicago PD” are set to combine for an action-packed ...

The crossover starts at 8 p.m. with "Chicago Fire" followed by "Chicago Med" at 9 p.m. and "Chicago P.D." at 10 p.m.

As One Chicago prepares for its first crossover event in five years, nearly a dozen characters make their debut for it!