The story begins during a Chicago Bears tailgate at Soldier Field, where a man collapses with a horrific, fast-moving infection .
A rare but deadly "flesh-eating" bacteria begins spreading rapidly across the city . [S8E4] Infection, Part I
Chicago Fire Season 8, Episode 4 – "Infection, Part I" . The story begins during a Chicago Bears tailgate
Watch the full series on Peacock or through Sky Go . Episode 4 – "Infection
Firehouse 51's first responders must work alongside the medical team at Gaffney Chicago Medical Center to contain the outbreak while the Intelligence Unit from Chicago P.D. investigates if the infection was spread intentionally .
You can find this episode and the rest of the crossover on major streaming platforms and digital stores: