Zach Braff Dr. John "J.D." Dorian Actor Donald Faison Dr. Chris Turk Actor John C. McGinley Dr. Perry Cox Actor Eliza Coupe Dr. Denise Mahoney Actor Kerry Bishé Lucy Bennett Actor Michael Mosley Drew Suffin Actor Dave Franco Cole Aaronson Actor Sarah Chalke Dr. Elliott Reid Guest Star Ken Jenkins Dr. Bob Kelso Guest Star Matthew Moy Trang Guest Star Robert Maschio Todd Guest Star Windell Middlebrooks Captain Duncook Guest Star Nicky Whelan Maya Guest Star Steven Cragg Lt. Underhill Guest Star, Writer Mark Behar Background Doctor Guest Star Walter Addison Ben Guest Star Gary Ballard Mr. Biegel Guest Star John Billingsley Alan Guest Star Antonio Sabato Jr. Himself Guest Star Jim Tasker Announcer Guest Star Bill Lawrence Executive Producer, Writer Kevin Etten Writer Prentice Penny Writer Corey Nickerson Writer Lon Zimmet Writer Josh Bycel Writer Sean Russell Writer Leila Strachan Writer Michael Alan Spiller Director Brian Bradley Writer Jonathan Groff Writer Dan Rubin Writer Ken Whittingham Director John Putch Director Rick Blue Director Michael McDonald Director Peter Lauer Director Eren Celeboglu Director