Anthony Edwards Dr. Mark Greene Actor George Clooney Dr. Doug Ross Actor Eriq La Salle Dr. Peter Benton Actor Noah Wyle Dr. John Carter Actor Julianna Margulies Head Nurse Carol Hathaway Actor Gloria Reuben Jeanie Boulet Actor Laura Innes Dr. Kerry Weaver Actor Alex Kingston Dr. Elizabeth Corday Actor Maria Bello Dr. Anna Del Amico Actor Jorja Fox Guest Star Lisa Nicole Carson Guest Star William H. Macy Guest Star Chad Lowe George Henry Guest Star Mariska Hargitay Guest Star Caitlin Dulany Heather Morgan Guest Star Danielle Harris Laura Quentin Guest Star Ted Rooney Neonatologist Dr. Tabash Guest Star James Callahan Oliver Guest Star Sondra Blake Ethel Hayes Guest Star Don Perry Dr. Sam Breedlove Guest Star Kristin Minter Randi Fronczak Guest Star Meredith Zinner Chasity Lee Guest Star Michael Crichton Executive Producer John Wells Executive Producer