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

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Chicago Fire - Season 8
Sandy Morris/NBC
Chicago Fire - Season 8
Sandy Morris/NBC

“Infection, Part I” (Chicago Fire)

Kidd (Miranda Rae Mayo), Natalie (Torrey DeVitto), Atwater (LaRoyce Hawkins), Jay (Jesse Lee Soffer), Brett (Kara Killmer), Hailey (Tracy Spiridakos), Severide (Taylor Kinney), Casey (Jesse Spencer), and Burgess (Marina Squerciati) deal with a medical emergency.

Chicago Fire - Season 8
Matt Dinerstein/NBC

Severide, Casey, Brett, and Jay wait for news at Med.

Chicago Fire - Season 8
Matt Dinerstein/NBC

Casey and Brett

Chicago Fire - Season 8
Matt Dinerstein/NBC

Natalie and Will (Nick Gehlfuss) provide a medical update.

Chicago Fire - Season 8
Matt Dinerstein/NBC

Meeting at 51

Chicago Fire - Season 8
Matt Dinerstein/NBC

Kidd, Severide, Brett, and Casey get an update.

Chicago Fire - Season 8
Matt Dinerstein/NBC

Boden (Eamonn Walker) wants answers.

Chicago Med- Season 5
Liz Sisson/NBC

“Infection, Part 2” (Chicago Med)

Vanessa Rojas (Lisseth Chavez) and Ethan (Brian Tee)

Chicago Med- Season 5
Liz Sisson/NBC

Atwater

Chicago Med- Season 5
Liz Sisson/NBC

Brett and Foster (Annie Ilonzeh)

Chicago Med- Season 5
Liz Sisson/NBC

Dr. Charles (Oliver Platt), Sharon (S. Epatha Merkerson), and Voight (Jason Beghe)

Chicago Med- Season 5
Liz Sisson/NBC

Dr. Charles and Voight, with a possibly infected Hailey

Chicago Med- Season 5
Liz Sisson/NBC

Jay visiting Hailey

Chicago Med- Season 5
Liz Sisson/NBC

Sharon and Dr. Charles in the quarantined area

Chicago Med- Season 5
Liz Sisson/NBC

Natalie hopefully bringing good news to Hailey

Chicago Med- Season 5
Liz Sisson/NBC

Will’s looking for answers.

Chicago P.D.- Season 7
Matt Dinerstein/NBC

“Infection, Part 3” (Chicago P.D.)

Mouch (Christian Stolte) and Platt (Amy Morton)

Chicago P.D.- Season 7
Matt Dinerstein/NBC

Jay, Voight, and Will

Chicago P.D.- Season 7
Matt Dinerstein/NBC

Burgess and Ruzek (Patrick John Flueger) go over what they know.

Chicago P.D.- Season 7
Matt Dinerstein/NBC

Vanessa Rojas (Lisseth Chavez)

Chicago P.D.- Season 7
Matt Dinerstein/NBC

Burgess and Ruzek

Chicago P.D.- Season 7
Matt Dinerstein/NBC

‘Fire’ in the field

Chicago P.D.- Season 7
Matt Dinerstein/NBC

Did she fall? Was she pushed? Did she jump?

Chicago P.D.- Season 7
Matt Dinerstein/NBC

Atwater, Hailey, and Jay

Chicago P.D.- Season 7
Matt Dinerstein/NBC

Hailey’s ready.

Chicago P.D.- Season 7
Matt Dinerstein/NBC

Cruz (Joe Minoso)

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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)See Also

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