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 Jonathan Scarfe Chase Carter Guest Star Morgan Nagler Natalie Logan Guest Star Troy Ruptash Dave Fern Guest Star Kimberly Russell Karen Fern Guest Star Paul McCrane Robert Romano Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Gedde Watanabe Nurse Yosh Takata Guest Star J.P. Hubbell EMT Lars Audia Guest Star Dinah Lenney Nurse Shirley Guest Star Nicole Bilderback Claire Guest Star Michael Crichton Executive Producer John Wells Executive Producer