Anthony Edwards Dr. Mark Greene Actor George Clooney Dr. Doug Ross Actor Sherry Stringfield Dr. Susan Lewis Actor Eriq La Salle Dr. Peter Benton Actor Noah Wyle Dr. John Carter Actor Zachary Browne Jake Leeds Guest Star Charley Lang Jason Warren Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Vanessa Marquez Nurse Wendy Goldman Guest Star Christine Harnos Guest Star CCH Pounder Dr. Angela Hicks Guest Star Gloria Reuben Jeanie Boulet Guest Star Rick Rossovich Dr. John 'Tag' Taglieri Guest Star Kathleen Wilhoite Chloe Lewis Guest Star Jason Barnhill Caleb Guest Star Jeff Seifert Thomas Ellison Guest Star Timmie Rogers Guest Star Michael Crichton Executive Producer John Wells Executive Producer