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 William H. Macy Guest Star Trevor Morgan Scott Anspaugh Guest Star Frances Sternhagen Millicent Carter Guest Star Bellina Logan Nurse Kit Guest Star Robert Ellenstein Dr. Swanson Guest Star Davenia McFadden Mrs. Bevins Guest Star John Walcutt Cancer Specialist Guest Star Paul McCrane Robert Romano Guest Star Megan Cole Dr. Upton Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Deezer D Nurse Malik McGrath Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Michael Crichton Executive Producer John Wells Executive Producer