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 Valerie Mahaffey Joi Abbott Guest Star Barbara Tarbuck Alice Presley Guest Star Djimon Hounsou Guest Star Roger Eschbacher Richard Tuggle Guest Star Tom Gallop Dr. Roger Julian Guest Star Dale Godboldo Hiltzik Guest Star David Hornsby Strauss Guest Star Steven Petrarca Dudzik Guest Star Akosua Busia Kobe Ikabo Guest Star Kristin Minter Randi Fronczak Guest Star Brian Lester Brian Dumar Guest Star Michael Crichton Executive Producer John Wells Executive Producer