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 Paul McCrane Robert Romano Actor Miguel Sandoval Mr. Perez Guest Star Martha Plimpton Meg Corwin Guest Star Vincent Kartheiser Jesse Keenan Guest Star Scott Ferguson Aaron Hearn Guest Star Rebecca De Mornay Elaine Nichols Guest Star Erik Palladino Dave Malucci Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Deezer D Nurse Malik McGrath Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Kristin Minter Randi Fronczak Guest Star George Clooney Actor Michael Crichton Executive Producer John Wells Executive Producer