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 Gina Ravera Dr. Bettina DeJesus Guest Star Josh Stewart Daniel Guest Star Josh Flitter Unicycle Boy Guest Star Mariana Klaveno Rebecca Guest Star J.P. Manoux Dr. Dustin Crenshaw Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Troy Evans Frank Martin Guest Star Marc Jablon Larry Weston Guest Star Angel Laketa Moore Nurse Dawn Archer Guest Star David Bowe Father of Unicycle Boy Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer