One Chicago's Heroes Face a Deadly Bacteria Taking Over the City (PHOTOS)

Meredith Jacobs

The heroes of One Chicago are banding together when a flesh-eating bacteria takes its toll on their city in a major crossover event.

Starting on Chicago Fire — it and Med are switching time slots for the occasion — the action will then move to the hospital drama and conclude with P.D.'s manhunt. "Infection" should feel like a three-hour movie, with "a lot of crossover within the hour on all three shows," Med EPs Diane Frolov and Andrew Schneider told TV Insider.

12 Things We Learned From One Chicago's 'Apocalyptic' Crossover Trailer (PHOTOS)

12 Things We Learned From One Chicago's 'Apocalyptic' Crossover Trailer (PHOTOS)

'Fire,' 'Med,' and 'P.D.' are teaming up to tackle a citywide attack and one of their own may be infected!

And as you can see in the photos in the gallery above from all three hours, there is plenty of that, with doctors, firefighters, paramedics, and cops tailgating when the crisis begins, together at the hospital, in a lab, and in the precinct, and more.

One Chicago Crossover Event, Wednesday, October 16, 8/7c, NBC