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NBC's Chicago shows are no stranger to a crossover. There's a steady stream of actors from Chicago Fire, Chicago P.D. and Chicago Med who drop by one of their sister show's sets each week, pretty much. But this week is the first time they've staged a giant, three-show crossover since Med premiered this fall.

E! News traveled to the set while the casts were filming the huge event, and they had lots of love for their fellow residents of the Dick Wolf universe. There's just one problem—it's a huge pain, logistics-wise, to schedule something like this.

"It's a headache, to be honest," jokes Fire's Taylor Kinney. "But a good one. There's so much going on that you really have to be on top of your character arc and where it's going."

The episode revolves around a criminal investigation surrounding three separate cases that involved cancer-free women overdosing on chemo—and it's got a major personal tie to Jason Beghe's Voight. "The storyline is so relevant to what's going on right now," says Med's Marlyne Barrett, and it involves personnel from all three emergency response branches.

Chicago Fire, Chicago PD, Chicago Med


"To me, that's what's really unique and authentic about this show—Dick Wolf and NBC have something so amazing," says P.D.'s Jon Seda. "In real life, when there's a big crisis going on, you see the fire come together, you see the EMTs come together, you see the police come together."

You'll see that collaboration in the three-part crossover, which P.D.'s LaRoyce Hawkins guarantees will make you emotional. "It is crazy, and it it's honestly, in my humble opinion, one of the best stories that we've been able to tell," he says. "Bottom line is when you see this crossover it's going to pull your heartstrings in a way that I don't think we've done just yet."

The crossover begins with Chicago Fire and Chicago Med on Tuesday, Jan. 5 from 9 to 11 p.m., and concludes the following day with Med at 10 p.m. on NBC.