A car accident that occurs at the Chicago Marathon leaves a victim in critical condition and tests the mettle of Dr. Halstead, April and her fourth-year medical resident brother Noah, who must perform a difficult procedure in the field. A mother brings in her 8-year-old girl experiencing a sudden hearing loss, and Dr. Manning is left to tend to the case, which takes a complicated turn. Dr. Choi deals with Olga, a woman who is malnourished, prompting him to bring in Dr. Charles to help assess the case. Meanwhile, Goodwin takes measures to get her personal life in order.
Elenco: Nick Gehlfuss , Marlyne Barrett , S. Epatha Merkerson , Oliver Platt , Yaya DaCosta , Torrey DeVitto , Brian Tee , Colin Donnell , Rachel DiPillo , Norma Kuhling , Dominic Rains , Kristen Hager , Guy Lockard .