Following the subway tunnel collapse, Ruzek and Kidd treat injured passengers and track down the missing offender. Archer and Frost perform a life-saving amputation. The crossover starts on Chicago Fire S13E11 In the Trenches (I). It continues on Chicago P.D. S12E11 In the Trenches (III).
| Creator | Dick Wolf |
|---|---|
| Actor | Steven Weber, Jessy Schram, Luke Mitchell |
| Country | United States of America |
| Production | Universal Television |