Chicago Fire,' 'Chicago Med,' and 'Chicago P.D.' bosses broke down the tragic events of the crossover event & how it will affect the future.

P.D.' showrunner Gwen Sigan promises 'some really fun character pairings between all three shows that are unexpected.'

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

There's an explosion near a government building, which causes the ensemble casts of all three One Chicago shows to arrive on the scene. There are injured and trapped victims all a