Chicago Fire's Casey Discovers a Gruesome Scene in One Chicago Crossover Sneak Peek

This year's One Chicago crossover feels like the zombie apocalypse. In an exclusive sneak peek at the three-way event, which airs Wednesday, Oct. 16 on NBC starting with Chicago Med at 8/7c, the Windy City's embattled first responders discover a gruesome scene while hanging out at a Chicago Bears

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• Chicago Fire
• Chicago Med
• Chicago P.D.
• Jesse Spencer
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