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 Lisa Nicole Carson Guest Star Julie Bowen Roxanne Please Guest Star Ashley Johnson Dana Ellis Guest Star Ann Gillespie Mrs. Ellis Guest Star Tommy Hinkley Mr. Ellis Guest Star Jack McGee Rodney McMullen Guest Star Dean Norris Clark Guest Star Yvonne Zima Rachel Greene Guest Star John Aylward Guest Star Michael Crichton Executive Producer John Wells Executive Producer