Karen Aldridge

Pete rethinks his career after learning that not every call has a happy ending, and Shay decides if she has a future with a married woman.

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.

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

Two of the team disagree about how to treat a patient with heart problems and Choi comes to the aid of an injured hoarder while out on paramedic duty.

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.

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