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 Scott Grimes Dr. Archie Morris Actor John Stamos Dr. Tony Gates Actor David Lyons Dr. Simon Brenner Guest Star Reiko Aylesworth Julia Dupree Guest Star Amy Aquino Dr. Janet Coburn Guest Star Yara Martinez Mia Guest Star William Lee Scott Jordan Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Fran Bennett Michelle Guest Star K Callan Kelly Robinson Guest Star Troy Evans Frank Martin Guest Star Marc Jablon Larry Weston Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer