The hospital's blood supply runs out during a devastating blizzard, forcing the doctors to make literal life and death decisions. Should Carter (Noah Wyle) try to save the life of a seriously wounded serial rapist, or should the blood go to someone more "deserving"? Elsewhere, Carol (Julianna Margulies) and Weaver (Laura Innes) tackle a crisis in the lives of a mentally challenged couple who have just become parents, and Weaver declares war on the duplicitous cost-cutting organization Syngergix. ~ Hal Erickson, Rovi