One Chicago crossover will have the impact of a 3-hour movie

“The keyword here is massive,” Chicago Med star Steven Weber, who plays Dr. Dean Archer, exclusively told Us of what’s to come on Wednesday, January 29. “The situation is massive. The amount of actors in all the shows is massive.”
He teased that Chicago Med, Chicago Fire and Chicago P.D. coming together and interacting is “ridiculous” and unlike anything they’ve done in the past.
“It’s not just a few here and maybe two here,” Weber, 63, shared. “I mean, it’s, here comes everybody and it’s gonna be a huge event.”
The episode, titled “In the Trenches,” will begin with Chicago Fire, which is a change from the regular One Chicago Wednesday lineup that usually begins with Chicago Med. Fire will be followed by Med and then P.D. will wrap up the night.

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“When a gas explosion rocks a high-rise, Chicago’s first responders come out in force to rescue hundreds of civilians,” the official logline reads. “It’s the calamity beneath the surface, however, that sends our heroes on a race to save 40 people trapped deep underground, including two of their own.”
While the names of the two first responders trapped haven’t been confirmed, Weber told Us that the showrunners “put all their creativity and their might into making this crossover,” teasing, “It was the most fun I ever had.”
Looking ahead, Sigan said viewers should prepare for a “fun ride,” telling Us, “I’m proud of it. I think that all the shows really came together as best as we could to make something really engaging and exciting.”
“It’s really good,” she added.
The One Chicago crossover event airs on NBC Wednesday, January 29, starting with Chicago Fire at 8 p.m. ET. Chicago Med airs at 9 p.m. ET with Chicago P.D. following at 10 p.m. ET.