Sharif Atkins joins the series as Michael Gallant, a new medical student assigned to Carter (Noah Wyle). While making the rounds with Gallant, Carter learns to his chagrin that his grandmother (Frances Sternhagen) is now a "high-risk" patient who may die at any moment; he also helps Lewis (Sherry Stringfield) treat another med student who has been cutting herself. Elsewhere, a mall security guard is driven to desperate measures after accidentally injuring a skateboarder; Elizabeth (Alex Kingston) tries to determine the identity of the person responsible for euthanizing four of her patients in post-op; and, claiming to be Reese's (Matthew Watkins) biological father, Roger (Vondie Curtis-Hall) demands custody of the boy. ~ Hal Erickson, Rovi