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.

Episode Viewers and Ratings

Season 8 Episode 4 of Chicago Fire was watched by 8,230,000 viewers, resulting in a 1.30 rating in the 18-49 demographic.

Is Chicago Fire Renewed or Cancelled for Season 9?

Chicago Fire Season 8 Episodes...

• s08e01 - Sacred Ground
• s08e02 - A Real Shot in the Arm
• s08e03 - Badlands
• s08e04 - Infection (1)
• s08e05 - Buckle Up
• s08e06 - What Went Wrong
• s08e07 - Welcome to Crazytown
• s08e08 - Seeing Is Believing
• s08e09 - Best Friend Magic
• s08e10 - Hold Our Ground
• s08e11 - Where We End Up
• s08e12 - Then Nick Porter Happened
• s08e13 - A Chicago Welcome
• s08e14 - Shut It Down
• s08e15 - Off the Grid (1)
• s08e16 - The Tendency of a Drowning Victim
• s08e17 - Protect a Child
• s08e18 - I'll Cover You
• s08e19 - Light Things Up
• s08e20 - 51's Original Bell

Chicago Fire Show Summary

No job is more stressful, dangerous or exhilarating than those of the Firefighters, Rescue Squad and Paramedics of Chicago Firehouse 51. These are the courageous men and women who forge headfirst into danger when everyone else is running the other way. But the enormous responsibilities of the job also take a personal toll.

With big reputations and hefty egos, the pressure to perform and make split-second decisions is bound to put squad members at odds. When a tragedy claims one of their own, there's plenty of guilt and blame to go around. In the middle of a divorce, Lt. Matthew Casey tries to go about business as usual, but can't help butting heads with the brash Lt. Kelly Severide of the Rescue Squad - and each blames the other for their fallen team member. When it's "go-time", though, they put their differences aside and put everything on the line for each other. This is a look inside one of America's noblest professions.