Chicago Fire

Season 2, Episode 20

Episode Title: A Dark Day (I)

Air Date: 2014-04-29

Overview:

Lt. Casey and Dawson volunteer to help at a charity run at Chicago Medical when a massive explosion sends Chicago into chaos. With one of their own missing in the blast, the firehouse is tested like never before. The crossover continues on Chicago P.D. S01E12 8:30 PM (II)