Zach Braff Dr. John "J.D." Dorian Actor Sarah Chalke Dr. Elliott Reid Actor Donald Faison Dr. Chris Turk Actor John C. McGinley Dr. Perry Cox Actor Judy Reyes Nurse Carla Espinosa Actor Ken Jenkins Dr. Bob Kelso Actor Neil Flynn The Janitor Actor Nicole Sullivan Jill Tracy Guest Star Lyn Alicia Henderson Rebecca Guest Star Robert Maschio Todd Guest Star David Warshofsky Dave Bradford Guest Star Frank Cameron Dr. Mickhead Guest Star Rene Hall Renee Guest Star Christina Miles Gloria Guest Star Beans Morocco Artie Guest Star Patrick Mulderrig Man Guest Star Kattia Ortiz Nurse Kattia Guest Star Meredith Roberts Quill Kathy Guest Star Brent Weber Larry Guest Star Rachel Winfree Jill's Mom Guest Star Jordan Zucker Lisa Guest Star Randall Keenan Winston Leonard Guest Star Bill Lawrence Executive Producer John Michel Director Tad Quill Writer