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Chicago Fire, Chicago P.D., Chicago Med crossover: Get the scoop

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Elizabeth Sisson/NBC

For what is sure to be the first of many, the Chicago shows will unite this week for an epic three-way crossover on Chicago Fire, Chicago Med and Chicago P.D.

During the two-night event, Med’s team rushes to save Fire’s Herrmann (David Eigenberg), who was stabbed in the winter finale, while P.D.’s unit searches for the culprit. Meanwhile, Firehouse 51 responds to a call that leads to a shocking discovery that will rock P.D.’s Voight (Jason Beghe), while P.D.’s Roman (Brian Geraghty) faces the consequences of killing a suspect in the winter finale. Can he prove it was a good shoot? EW caught up with executive producer Matt Olmstead to get the scoop:

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ENTERTAINMENT WEEKLY: What is the through line for the three-way crossover?

MATT OLMSTEAD: We’re starting with Fire in the 9 p.m. hour on Tuesday, switching with Med. They respond to a fire where a woman looks like she may have been trying to commit suicide. We’re not quite sure. When we take her to Med, her levels are all off. It’s a medical mystery, which throws us into the Med hour. It kicks off into a much larger medical story based on a headline late last year, where a doctor was misdiagnosing and overprescribing cancer medicine, chemo in particular. While figuring out what happened, more women come forward as we start to peel back layers of how deep this goes. Ultimately, it’s thrown to P.D., because it’s a criminal investigation, a very hard one to prove because the burden is there was an intent to have these people killed. Short of that, it’s just medical malpractice. It’s becomes increasingly nefarious. Through that is the revelation for Voight that his late wife, who we’ve established on the show passed away from cancer, the last doctor she ever sought treatment from is the guy who’s in their crosshairs. So, it’s Voight basically investigating and wanting to have answers in terms of not only the current victims they’re encountering, but his late wife as well.

What can you tease for the fight to save Herrmann and how it’s affecting everyone?

Our cliffhanger at the holiday break, he was stabbed, so we have this dual track storyline in saving Herrmann at Med. It’s great that we have Med now, because we get to really see characters from that show that we know fighting to save Herrmann’s life. What really has the emotional ramifications — beyond the immediate concern of whether or not he’s going to live or die — is this huge guilt that Cruz carries, because the guy who stabbed Herrmann was brought into their world by Cruz, with good intentions, but we all know the saying about good intentions. So you have Cruz wracked with guilt, and other people, particularly Severide, who are looking at Cruz a little sideways in terms of did he get this whole ball rolling? Would this have ever happened to Herrmann if Cruz didn’t bring in a gang member trying to turn his life around? It really rocks everybody. Beyond the immediate concern of Herrmann’s fate, it’s how this happened, why this happened.

Elizabeth Morris/NBC

What can you tease of the hunt for Freddie, the man who stabbed him?

Another luxury of having these three shows as opposed three cop shows, these are three distinct shows that are obviously part of the different worlds of Chicago, so we’re able to throw it over to P.D. quickly in the crossover. It’s not just some nondescript detective coming to help out. It’s a character that we know about, who knows Herrmann, cares about Herrmann, so there’s automatic investment from the police in their investigation. It’s an intense investigation also involving Cruz, who knows that world. He goes a little too far and gets in over his head, because he’s determined to bring Freddie to justice, because he feels responsible for bringing Freddie into Herrmann’s world.

With Voight dealing with the possibility that his wife was murdered, does this bring out the dark side in him?

What’s interesting about it is it’s the opposite. When Jason Beghe read the script, he was having trouble trying to figure out how to play it, because it runs so deep for his character. There’s a scene in there where there’s a confrontation. Nine out of 10 times, Voight would be a little more active in that confrontation. He was saying, “I don’t feel like being the bull in the china shop in this storyline.” He was wondering why that impulse was kicking in. I mentioned to him that for Voight in this story, as I saw it, once he knows that his late wife was seen by this guy, that thereafter Voight’s late wife is present in every scene. He doesn’t want to disrespect her memory by doing anything that would upset her, essentially. Once we started talking about that, it unlocked it for him. If you watch, it really is resonant in that it’s a different Voight, but it all stemmed from this agreement that we came up with that his wife’s in every one of those scenes.

Matt Dinerstein/NBC

On P.D., we’re also seeing Roman deal with the aftermath of shooting that man. What can you tease for that?

Roman thinks he’s cooked. He’s basically given up. His character has a little bit more of a wary approach to politics and how things work. He’s never wanted to go up to Intelligence. He likes being a uniform cop, but he’s been burned before. He’s just resigned that there’s no way he’s going to wiggle off this hook. It’s gratifying for us, because this is a storyline that we planned from the very beginning. This was the payoff for the story that took some turns, where he was helping out this kid, he was going to donate bone marrow for the surgery, the kid didn’t make it, he connected with the kid’s mom, and then all of a sudden now the whole thing flips where no good deed goes unpunished, which confirms a lot of pessimistic world views that he possess. He’s given up. It’s Burgess, his partner, who hasn’t. She’s dogged in her approach to what really happened, because she believes her partner. Ultimately, with the help of Platt, who’s always a bit of her foil, Platt steps up as well and they have to find a way to save Roman’s career, by extension, his life, because he’s so tied to being a cop.

Matt Dinerstein/NBC

The three-way crossover kicks off with Chicago Fire on Tuesday at 9 p.m. ET, continuing with Chicago Med at 10 p.m. ET, and concluding on Chicago P.D. Wednesday at 10 p.m. ET on NBC.