Chicago Fire - Season 2 Episode 20 -
Season 2, Episode 20 - A Dark Day (1)
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. (8:30 PM (2) aired on Chicago P.D., season 1, episode 12.)
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