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 Steve Buscemi Art Masterson Guest Star Stanley Tucci Dr. Kevin Moretti Guest Star Sam Jones III Chaz Pratt Guest Star Leland Orser Dr. Lucien Dubenko Guest Star John Aylward Dr. Donald Anspaugh Guest Star Michael Gaston Rick Guest Star Liza Lapira Christine Guest Star J.P. Manoux Dr. Dustin Crenshaw Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Troy Evans Frank Martin Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer