Noah Wyle Dr. John Carter Actor Laura Innes Dr. Kerry Weaver Actor Alex Kingston Dr. Elizabeth Corday Actor Goran Visnjic Dr. Luka Kovac Actor Maura Tierney Abby Lockhart Actor Sherry Stringfield Dr. Susan Lewis Actor Mekhi Phifer Dr. Gregory Pratt Actor Parminder Nagra Dr. Neela Rasgotra Actor Linda Cardellini Nurse Samantha Taggart Actor Shane West Actor Red Buttons Jules 'Ruby' Rubadoux Guest Star Donal Logue Chuck Martin Guest Star Eion Bailey Jake Scanlon Guest Star Pat Carroll Rebecca Chadwick Guest Star Leland Orser Dr. Lucien Dubenko Guest Star John Aylward Dr. Donald Anspaugh Guest Star Louise Fletcher Roberta 'Birdie' Chadwick Guest Star Sam Anderson Dr. Jack Kayson Guest Star Scott Grimes Dr. Archie Morris Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer