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 Kellie Martin Lucy Knight Actor Paul McCrane Robert Romano Guest Star Laurie O'Brien Mrs. Richards Guest Star Mare Winningham Dr. Amanda Lee Guest Star Cork Hubbert Grumpy Elf Guest Star Travis McKenna Mr. DeMisa Guest Star Julia Whelan Laura Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Gedde Watanabe Nurse Yosh Takata Guest Star Michael Crichton Executive Producer John Wells Executive Producer