Season 2 Episode 20 episode 20

Chicago Fire Season 2 Episode 20 “A Dark Day” Photos

Chicago Fire Season 2 Episode 20 “A Dark Day” Photos

Chicago Fire - Season 2Lt. Casey and Dawson volunteer to help at a charity run at Chicago Medical when a massive explosion sends Chicago into chaos.

RELATED | Chicago Fire Season 2 Episode 20 “A Dark Day” Guide

Check out the sneak peek images for "A Dark Day" (airing on April 29) in the gallery below:

Source: NBC