Chicago Fire Season 8, Episode 4: Watch the One Chicago crossover live

CHICAGO FIRE -- "Infection, Part I" Episode 805 -- Pictured: (l-r) Eamonn Walker as Battalion Chief Wallace Boden, Annie Ilonzeh as Emily Foster, Kara Killmer as Sylvie Brett -- (Photo by: Matt Dinerstein/NBC)
CHICAGO FIRE -- "Infection, Part I" Episode 805 -- Pictured: (l-r) Eamonn Walker as Battalion Chief Wallace Boden, Annie Ilonzeh as Emily Foster, Kara Killmer as Sylvie Brett -- (Photo by: Matt Dinerstein/NBC) /
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It’s time for the One Chicago crossover of 2019. Chicago Fire Season 8, Episode 4 kicks off the night and here’s how to watch the whole thing live.

There’s a slight change to the One Chicago schedule this week. Chicago Fire is moving to the 8 p.m. slot, as it kicks off the One Chicago crossover of 2019. The three-episode, one-night event is going to take you through plenty of drama, horror, and more.

Firehouse 51 starts the episode when they attempt to host a football tailgate. That all goes terribly wrong when someone comes to them with a case of flesh-eating bacteria.

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Just an isolated case? If only! Someone has managed to weaponize the bacteria, and now everyone is at risk. The first responders take the threat seriously, pulling in Med and PD to tackle the situation. They’ll also need to work along side the CDC to get the situation under control.

It’s Severide who suspects that there’s something bigger to this. After all, at first they’ll just think that there are numerous victims with the same disease. Bacterial infections can pass on, right? When you look at the trailer for the One Chicago crossover event, that’s when we learn that someone has weaponized this.

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Even if you don’t usually watch all three One Chicago shows, you’re going to want to check them all out tonight. Chicago Fire Season 8, Episode 4 kicks things off with “Infection, Part I.” That then continues with Chicago Med Season 5, Episode 4, titled “Infection, Part II.” And yes, “Infection, Part III” is the Chicago PD storyline, as the case is fully wrapped up and the suspect caught.

Check out the promo and synopsis for Chicago Fire and the entire One Chicago crossover:

"In the first part of a three-show crossover event, a rare but deadly bacteria takes its toll on numerous victims around the city, leaving Chicago’s finest first responders to work together alongside the CDC to resolve the dangerous situation. Following a fire at a local university that ties into the outbreak, Severide has suspicions that something bigger is happening."

CHICAGO FIRE — “Infection, Part I” Episode 805 — Pictured: (l-r) Marina Squerciati as Officer Kim Burgess, Torrey DeVitto as Dr. Natalie Manning, Tracy Spiridakos as Det. Hailey Upton, Miranda Rae Mayo as Stella Kidd, Kara Killmer as Sylvie Brett, LaRoyce Hawkins as Officer Kevin Atwater — (Photo by: Sandy Morris/NBC)
CHICAGO FIRE — “Infection, Part I” Episode 805 — Pictured: (l-r) Marina Squerciati as Officer Kim Burgess, Torrey DeVitto as Dr. Natalie Manning, Tracy Spiridakos as Det. Hailey Upton, Miranda Rae Mayo as Stella Kidd, Kara Killmer as Sylvie Brett, LaRoyce Hawkins as Officer Kevin Atwater — (Photo by: Sandy Morris/NBC) /

Chicago Med Season 5, Episode 4 continues the story with:

"An entire apartment complex is forced into quarantine when cases of a deadly virus turn into an epidemic; P.D. chases a lead that could point to a case of bioterrorism, and Will gets dangerously close to the suspect."

CHICAGO P.D.- “Infection Part III” Episode 707 — Pictured: (l-r) Christian Stolte as Randy “Mouch” McHolland, Amy Morton as Desk Sgt. Trudy Platt — (Photo by: Matt DinersteinNBC)
CHICAGO P.D.- “Infection Part III” Episode 707 — Pictured: (l-r) Christian Stolte as Randy “Mouch” McHolland, Amy Morton as Desk Sgt. Trudy Platt — (Photo by: Matt DinersteinNBC) /

It’s all finished with Chicago PD Season 7, Episode 4:

"After zeroing in on a suspect responsible for bioterrorism, the P.D. prepares to undertake its biggest manhunt yet; Upton is torn between helping track down the perp and providing emotional support to a scared young girl who needs her."

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Don’t miss out on tonight’s three-hour event. This is a night you need to make sure everything is on record and in order. Double check your listings and your settings. Here are all the details you need to start tuning in with Chicago Fire.

Date: Wednesday, Oct. 16
Start Time: 8/7c
Episode: Season 8, Episode 4, “Infection, Part I”
TV Channel: NBC
Live Stream: Stream 1 | Stream 2