Halloween apparently brings out the worst in Benton (Eriq La Salle), who has a heated confrontation with Gant (Omar Epps). Elsewhere in the ER, the staff treats an eight-year-old trick or treater and her father, both of whom had been mowed down by a hit-and-run driver; and Greene (Anthony Edwards) pines for the vacationing Lewis (Sherry Stringfield). And on the street, Ross (George Clooney) and Carol (Julianna Margulies) are in for quite a few shocks and surprises as they ride along on the roving Health Mobile, which provides emergency treatment to the homeless. ~ Hal Erickson, Rovi