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 Kyle Chambers Ricky Abbott Guest Star Djimon Hounsou Guest Star Akosua Busia Kobe Ikabo Guest Star Conor O'Farrell Richard Abbott Guest Star Ed Lauter Fire Captain Dannaker Guest Star Patricia Forte Mrs. Martino Guest Star Paul McCrane Robert Romano Guest Star John Aylward Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Michael Crichton Executive Producer John Wells Executive Producer