Halloween night has several surprises in store for the ER staff as they treat a young car-crash victim whose gender is a matter of debate, and a schizophrenic woman (Sheila Kelley) who insists that she's about to give birth despite all evidence to the contrary. Meanwhile, Greene (Anthony Edwards) gets stunning news from his daughter, Rachel (Yvonne Zima). Carter (Noah Wyle) gets in hot water when he leaves Lucy (Kellie Martin) to supervise a wild med-school dorm party. And Weaver (Laura Innes) spends several humiliating hours putting up with a rival candidate for the office of ER chief. ~ Hal Erickson, Rovi