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

There's a shift in show order for the crossover event. “Chicago Fire” will air first at 8 p.m., followed by “ Chicago Med “ at 9 p.m., with “ Chicago P.D .” concluding the event at 10 p.m.

LaRoyce Hawkins of "Chicago PD," "Chicago Fire's" Miranda Rae Mayo, and Darren Barnet from "Chicago Med" talk about the first Wednesday night "One Chicago" crossover event in more than five years. The casts of all three shows will combine for a full three hours of pulse-pounding prime time action.

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

He really made it seem as though he was going to be front and center, going as far as to poke fun at Chicago Med star Steven Weber. It was all a ruse, however, and the actor will

Firehouse 51, Gaffney's finest, and P.D.'s Intelligence Unit are coming together to save the day on Wednesday, January 29.