Mia Park

Lt Casey must work with Voight and the Intelligence Unit, Shay grows increasingly excited about the prospect of motherhood, and everyone comes together to support the opening of Molly's.

Dr Manning and Dr Charles treat a teenage girl whose rapidly changing set of symptoms has everyone perplexed.

The team find a surprising connection between two elderly patients presenting similar symptoms. Dr Manning loses her wedding ring.

Dr Manning investigates a young boy's background after the child is admitted with a broken wrist. Dr Choi tries to deal with an erratic patient.

The Firehouse 51 crew have their work cut out for them when a tornado hits the city. Also, Brett must report Chilli after she makes a big mistake.

Halstead and Manning deal with arguing brothers, one of whom needs a replacement kidney. One of Dr Reese's patients comes to a crossroad.