Anthony Edwards Dr. Mark Greene 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 Goran Visnjic Dr. Luka Kovac Actor Michael Michele Cleo Finch Actor Maura Tierney Abby Lockhart Actor Ming-Na Wen Actor Paul McCrane Robert Romano Actor Yvette Freeman Nurse Haleh Adams Guest Star Giuliana Santini Kathleen Brant Guest Star Dirk Blocker Mr. Groder Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Victor Campos Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Deezer D Nurse Malik McGrath Guest Star Shia LaBeouf Darnel Smith Guest Star Michael Mantell Mr. Spencer Guest Star Chris Marquette Marty Dorset Guest Star Michael Crichton Executive Producer John Wells Executive Producer