 When Elliot s engagement ring doesn t fit, she feels that the perfect proposal she s always dreamed of is ruined and takes back her yes. To make up for it, Keith lets her plan her dream proposal; Elliot s visiting sorority sister, Melody (guest star Keri Russell), continues to spurn J.D. s advances; Carla s still not emotionally ready to have sex after having a baby, driving Turk over the edge; J.D. has an epiphany.