The first three-hour crossover in more than five years unites the crews from 'Chicago Fire,' 'Chicago P.D.' and 'Chicago Med.'

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

What did you think of the epic One Chicago crossover "In the Trenches"? Read our full review of the three-hour spectacle now.

After five years, the One Chicago franchise finally has another three-part crossover event airing tonight, and the bosses previewed what’s in store. Beginning with Chicago Fire at 8 p.m. ET, the event’s official logline reads,

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