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 John Aylward Actor Mare Winningham Dr. Amanda Lee Guest Star Dennis Boutsikaris Dr. David Kotlowitz Guest Star Julie Bowen Roxanne Please Guest Star Sam Anderson Dr. Jack Kayson Guest Star Caitlin Alderton Skye Guest Star Aimee Graham Mrs. Everly Guest Star Bellina Logan Nurse Kit Guest Star David Brisbin Dr. Alexander Babcock Guest Star Dana Gladstone Weingarten's Trepanation Expert Guest Star Octavia Spencer Maria Jones Guest Star Michael Crichton Executive Producer John Wells Executive Producer