IMAGES: Chicago Fire Season 3 Episode 19 “I Am The Apocalypse”

Get your first look at Chicago Fire‘s backdoor pilot for Chicago Med with our large “I Am The Apocalypse” image gallery

The April 7 episode sees Firehouse 51 racing to the scene of a deadly chemical leak inside an industrial building.

With squad and truck tested like never before, scores of workers are rescued but many are experiencing respiratory distress. This prompts truck 81, squad 3 and ambulance 61 to spring into action to transport the victims to nearby Chicago Med.

The situation goes from bad to worse in the midst of the chaos when a “patient” planted inside the hospital goes on a suicide mission armed with a grenade and claiming to be the carrier of a deadly airborne disease. Trying to stop the madman from engaging the explosive device, a member of the firehouse team is severely wounded in the blast and left to face life-threatening injuries.

With no other choice, Chicago Med is forced into lockdown until doctors and the Hazmat team can determine the severity of the airborne virus.

CHICAGO FIRE -- "I Am The Apocalypse"

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CHICAGO FIRE -- "I Am The Apocalypse" Episode 319 -- Pictured: (l-r) Yuri Sardarov as Otis, Jesse Spencer as Matthew Casey, Monica Raymund as Gabriela Dawson -- (Photo by: Elizabeth Morris/NBC)