On a busy Halloween night, Carter and Abby are the only staffers in costume when victims of an apartment building fire pack the ER. Corday takes on a new med student for a surgical rotation--Paul Nathan, who suffers from Parkinson's disease, and only decided to pursue medicine after his diagnosis. Despite a difficult first day, both professionally and medically, Nathan makes a difficult diagnosis. Romano's rehab lags behind his expectations, and he begins to doubt his role if surgery is no longer an option. In a moment of personal weakness, he tries to express his feelings for Corday. Weaver continues to display erratic behavior, raising staff suspicions she might be going through menopause. Luka's affair with Chuny is revealed, and tensions rise when he treats a patient with a perpetual erection.