[s3e19] I Am The Apocalypse (2026)

Lieutenant Kelly Severide is critically injured in the blast while trying to stop the attacker. He spends much of the hour in surgery, experiencing visions of his late friend Shay while Dr. Hannah Tramble (Laurie Holden) fights to save him. Major Introductions & Arcs

Testing eventually proves the virus is not contagious, allowing the quarantine to be lifted. [S3E19] I Am The Apocalypse

Hospital administrator Sharon Goodwin (S. Epatha Merkerson) places the facility under immediate quarantine, trapping members of 51 inside with a potential biohazard and an active electrical fire in the ceiling. Lieutenant Kelly Severide is critically injured in the

Severide survives his surgeries but is shaken by the near-death experience. Major Introductions & Arcs Testing eventually proves the

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.

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:

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