Walking on a Dream

Music
This episode's title originated from the song , originally sung by .

Main cast

 * Ellen Pompeo as Dr. Meredith Grey


 * Sandra Oh as Dr. Cristina Yang


 * Justin Chambers as Dr. Alex Karev


 * Chandra Wilson as Dr. Miranda Bailey


 * James Pickens Jr. as Dr. Richard Webber


 * Sara Ramirez as Dr. Calliope 'Callie' Torres


 * Kevin McKidd as Dr. Owen Hunt


 * Jessica Capshaw as Dr. Arizona Robbins


 * Sarah Drew as Dr. April Kepner


 * Jesse Williams as Dr. Jackson Avery


 * Patrick Dempsey as Dr. Derek Shepherd

Guest stars

 * Adina Porter as Dr. Ramsey


 * Gaius Charles as Shane


 * Tina Majorino as Heather


 * Jim Turner as Dr. Schacter