Teenage patients pour into the ER after a suspicious explosion in a high school science class. Lawrence (Alan Alda) becomes erratic and violently angry, leading the staff to wonder if the veteran doctor is functioning at full capacity. Elaine (Rebecca De Mornay) hopes to "connect" with her former brother-in-law, Carter (Noah Wyle), before heading to Europe. Dr. Dave (Erik Palladino) gets another much-needed lesson in humanity and humility. Carol (Julianna Margulies) is outraged to discover that pregnant waitress Meg (Martha Plimpton) is shooting heroin. And Jeanie (Gloria Reuben) is finding it increasingly difficult to juggle her workload with her domestic duties. ~ Hal Erickson, Rovi