[s8e4] Infection, Part I May 2026

is the fourth episode of Season 8 of the action-drama series Chicago Fire . It serves as the opening chapter of a massive three-part crossover event within the Chicago franchise, involving characters from Chicago Fire , Chicago Med , and Chicago P.D. . Crossover Viewing Order

Chicago Med Season 5, Episode 4 – "Infection, Part II" . [S8E4] Infection, Part I

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 . is the fourth episode of Season 8 of

Chicago Fire Season 8, Episode 4 – "Infection, Part I" . Crossover Viewing Order Chicago Med Season 5, Episode

The story begins during a Chicago Bears tailgate at Soldier Field, where a man collapses with a horrific, fast-moving infection .

Watch the full series on Peacock or through Sky Go .

Individual episodes are available for purchase on Apple TV and Amazon Prime Video .