Sally Field makes the first of several appearances in the Emmy-winning role of Maggie Wyczenski, the bipolar mother of ER nurse Abby Lockhart (Maura Tierney). Off her medication, a hyper Maggie tries to pay a visit to Abby -- who refuses to see her. Meanwhile, Kovac (Goran Visnjic) looks into a suspected case of child abuse. In a rush to begin her vacation, Elizabeth Corday (Alex Kingston) makes a serious mistake during an operation. And Benton (Eriq La Salle), grieving over his murdered nephew, takes out his rage on Malucci (Erik Palladino) ~ Hal Erickson, Rovi