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 Paul McCrane Robert Romano Actor Ming-Na Wen Actor Sherry Stringfield Dr. Susan Lewis Actor Sharif Atkins Actor Mekhi Phifer Dr. Gregory Pratt Actor Parminder Nagra Dr. Neela Rasgotra Actor Linda Cardellini Nurse Samantha Taggart Actor Allison Smith Denny Guest Star Bob Newhart Ben Hollander Guest Star Michael Angarano Zack Guest Star Sarah Shahi Tara King Guest Star Glenn Howerton Dr. Nick Cooper Guest Star Abraham Benrubi Jerry Markovic Guest Star Deezer D Nurse Malik McGrath Guest Star Troy Evans Frank Martin Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Melany Bell Zack's mom Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer