Karen Aldridge

Severide springs into action when gunmen open fire on the subway. Gabby Dawson learns a harsh lesson on her first day as a firefighter.

The team transport the victims of a terrible chemical leak to Chicago Med, where a bad situation quickly turns seriously worse.

Dr Halstead treats a blast from his past, and Manning and Charles try to treat a young patient who refuses to take medication.

Firehouse 51 joins forces with the Chicago Police Department to combat a massive explosion that leaves the city in carnage and one of the crew missing.

Casey tries to convince everyone he is healthy, Shay avoids the lawyer who wants to talk about Daryl's suicide, Otis and Katie grow closer, and Boden helps a woman with a negligent landlord.

Dr Rhodes begins his cardiothoracic surgery fellowship, but gets off on the wrong foot with his new boss, Dr Latham. Meanwhile, Dr Choi begins his life as chief resident, and Sarah is caught off-guard by Dr Charles.