Here's the official guide of Grey's Anatomy season 9 episode 12 "Walking on a Dream" -- which airs on Thursday, Jan. 24 on ABC.
A NEW DOCTOR SHAKES UP NERVES AT SEATTLE GRACE ---
Guest Starring Constance Zimmer ("Entourage") and Justin Bruening ("All My Children")
- The Seattle Grace doctors are on edge when a new medical professional enters the hospital.
- Arizona struggles with the emotional and physical pain of a phantom limb.
- And while battling pregnancy hormones, an overly-emotional Meredith is confronted with her worst fear.