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 Matt Doherty Eli Emerson Guest Star Kerri Green Lynn Parker Guest Star Bradley Gregg Ken Parker Guest Star John Cullum David Greene Guest Star Michael Cavalieri Mr. Fazio Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Joel McKinnon Miller Mr. Emerson Guest Star Kristin Minter Randi Fronczak Guest Star Gedde Watanabe Nurse Yosh Takata Guest Star Michael Crichton Executive Producer John Wells Executive Producer