[s3e19] I Am The Apocalypse -

This episode introduced the core cast that would eventually lead Chicago Med :

(Yaya DaCosta): An ER nurse with a past connection to Severide. [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 . This episode introduced the core cast that would

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

Testing eventually proves the virus is not contagious, allowing the quarantine to be lifted.

(Oliver Platt): Chief of Psychiatry, whose first meeting with Chief Boden is a fan-favorite moment.