Anthony Ferraris

Will and Nellie struggle to diagnose a patient with a rare disorder. CFD and Med staff work to free a paranoid father trapped in the MRI suite. Kai gets an ego check.

Halstead and Hammer get stuck in the middle of a marital face-off; Blake's entire surgical team mysteriously collapses during a liver transplant; Charles encourages Choi to reconcile with his father.

Chief Boden is being investigated by internal affairs following complications at a call-out, and the crew become frustrated with the increased scrutiny.

Herrmann goes against orders when he returns into a fire to save a child. He later takes matters into his own hands again.

A wave of threats hit Chicago, leaving Firehouse 51 in a desperate situation. Meanwhile, Chili's behaviour continues to cause concern.

Severide confronts Chili about her erratic behaviour. However, she does not handle his intervention well.