Goran Visnjic Dr. Luka Kovac Actor Maura Tierney Abby Lockhart Actor Mekhi Phifer Dr. Gregory Pratt Actor Parminder Nagra Dr. Neela Rasgotra Actor Linda Cardellini Nurse Samantha Taggart Actor Shane West Actor Scott Grimes Dr. Archie Morris Actor Laura Innes Dr. Kerry Weaver Actor John Stamos Dr. Tony Gates Actor Stanley Tucci Dr. Kevin Moretti Guest Star Kari Matchett Dr. Skye Wexler Guest Star Steven Christopher Parker Guest Star Reiko Aylesworth Julia Dupree Guest Star Mae Whitman Heather Guest Star Amy Aquino Dr. Janet Coburn Guest Star Troy Evans Frank Martin Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Marc Jablon Larry Weston Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer