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 Parkinsons disease, and only decided to pursue medicine after his diagnosis. Despite a difficult first day, both professionally and medically, Nathan makes a difficult diagnosis. Romanos 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 about her menopause. Lukas burgeoning sex addiction worsens, as an affair with Chuny is revealed, and tensions rise when he treats a patient with a perpetual erection.