Watch Chicago Fire S08e15 Webrip - X264-ion10-1

, titled " Off the Grid ," serves as the first part of a two-hour crossover event with Chicago P.D. (concluding in Chicago P.D. S07E15, "Burden of Truth"). The episode follows Firehouse 51 as they respond to a localized epidemic of teen opioid overdoses, leading to the return of former Chicago P.D. officer Sean Roman. Key Plot Developments Chicago Fire season 8, episode 15 takeaways: Off The Grid