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Chicago Fire Season 8, Episode 4 – "Infection, Part I" . [S8E4] Infection, Part I
Chicago P.D. Season 7, Episode 4 – "Infection, Part III". Episode Overview
As panic grows, the city's heroes face a race against time to identify the source of the bacteria before it becomes a full-blown epidemic. Where to Watch Individual episodes are available for purchase on Apple
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
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 . Chicago P
Chicago Med Season 5, Episode 4 – "Infection, Part II" .