Next Wednesday, Chicago Fire, Chicago Med and Chicago P.D.will stage its biggest crossover to date and TV Guide has your first look.

In this exclusive preview at next week's three-hour event, P.D.'s Jay Halstead (Jesse Lee Soffer) has a personal stake in Firehouse 51's latest dangerous call. Realizing that his father is in the burning building, he desperately searches for a way to get to him but is stopped by Boden (Eamonn Walker) who tells him, "I can't have a cop get killed on my fire ground." For Jay's sake, let's hope Truck 81 can get to his dad before it's too late!

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See the official descriptions for all three episodes below.

Chicago Fire
Airdate: Oct. 3 at 8/7c (special time)
Description: Firehouse 51 is faced with a daunting challenge when an out-of-control blaze consumes a 15-story apartment complex, trapping victims on the top floors. Complicating the rapidly escalating situation, members soon discover that someone close to home may be one of the trapped victims.

Chicago Med
Airdate: Oct. 3 at 9/8c (special time)
Description: The doctors and nurses of Chicago Med find themselves on high alert when an overflow of patients are rushed into the doors following a terrifying apartment complex blaze. Dr. Rhodes fights to save the life of one of "Chicago Fire's" own, while Dr. Halstead and his brother Jay struggle with their own personal battle.

Chicago P.D.
Airdate: Oct. 3 at 10/9c (special time)
Description: After discovering the true cause of the high-rise fire, Intelligence races to find the man responsible. And for Halstead, it's personal.

The One Chicago crossover event airs Wednesday, Oct. 3 on NBC starting with Chicago Fire at 8/7c, followed by Chicago Med at 9/8c and Chicago P.D. at 10/9c.