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.