The episode begins with Firehouse 51 responding to a massive at an industrial factory. After rescuing dozens of victims suffering from respiratory distress, the team transports them to Chicago Med . While at the hospital, the situation spirals into chaos:
In the wake of the trauma, Dawson and Casey share a romantic reconciliation at Molly’s, though the stability of their relationship remains a lingering question. [S3E19] I Am The Apocalypse
A patient enters the ER claiming to carry a deadly airborne virus (revealed later as Marburg) and detonates a grenade . The episode begins with Firehouse 51 responding to
Testing eventually proves the virus is not contagious, allowing the quarantine to be lifted. A patient enters the ER claiming to carry
The episode "[S3E19] I Am the Apocalypse" serves as the high-stakes backdoor pilot for Chicago Med . First airing on April 7, 2015, it masterfully transitions from a standard rescue mission to a terrifying medical siege. Plot Summary