Dylan and Archer diagnose a pregnant woman with a serious infection. Maggie receives shocking news. Will and Charles question an elderly patient’s Alzheimer’s diagnosis. In an effort to help a patient, Crockett takes a risk.
A citywide blackout during a code black leaves the staff in chaos; Elliot and Heather are trapped in an elevator with a woman in active labor; Willis and Dr. Nolan help a 92 year-old woman who thinks it's 1942.