Chicago Fire boss Derek Haas has revealed that the show is set to crossover with Chicago Med and Chicago PD – and he has more details about the upcoming One Chicago storyline.
In an episode next season, all of the three Windy City-based drama series will link together for a joint plot. Chicago Fire's fourth episode will be the starting point for the exciting crossover.
Speaking to TVLine about the exciting prospect, Haas explained that he and Law & Order creator Dick Wolf came up with the idea.
Related: Chicago Med is bringing back departing cast member for exit storyline
"Dick and I came up with the story, and then I'm writing the three episodes, which will be really fun," Haas said.
"I haven't written Med since we did the Med [spinoff] episode. But you'll see why that's feasible, because it's less about each show having its own shape to it and more like all three shows really intertwined throughout.
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"You could be watching any hour and be like, 'Oh, wait, is this P.D.? Or is this Med? Or is this Fire?' We're even doing scenes that you would think would be a Med scene, but it's in the Fire hour."
Related: Everything you need to know about Chicago Med season five
Discussing the concept behind the crossover, Haas explained: "We were thinking of like Poseidon Adventure or like Independence Day.
"Where you've got a bunch of stories — cutting to one, cutting to another — and there's a mystery, both medical and criminal, going on that we're trying to solve before it gets out of hand."
Chicago Fire, Chicago Med and Chicago PD all air on NBC in the US and Sky Witness, Universal and 5USA in the UK.
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