Mekhi Phifer Dr. Gregory Pratt Actor Maura Tierney Abby Lockhart Actor Linda Cardellini Nurse Samantha Taggart Actor Goran Visnjic Dr. Luka Kovac Actor Parminder Nagra Dr. Neela Rasgotra Actor Shane West Actor Scott Grimes Dr. Archie Morris Actor Laura Innes Dr. Kerry Weaver Actor John Stamos Dr. Tony Gates Guest Star Kristen Johnston Guest Star Sharif Atkins Dr. Michael Gallant Guest Star John Leguizamo Dr. Victor Clemente Guest Star Serena Williams Alice Watson Guest Star Kat Dennings Zoe Butler Guest Star Alex Rocco Martin Trudeau Guest Star Abraham Benrubi Jerry Markovic Guest Star Yvette Freeman Nurse Haleh Adams Guest Star April L. Hernandez Nurse Inez Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer