The full episode video stream of Grey's Anatomy s05e12/Grey's Anatomy 5.12 will be available on this page soon for those of you who prefer to watch it online. Please check back for it regularly. In the meantime, here is the official plot summary of Grey's Anatomy season 5 episode 12, Sympathy for the Devil. The preview video follows at the bottom of this post.
Derek's mother, Carolyn, makes a surprise visit to Seattle and meets Meredith for the first time, as Mark tries to conceal his relationship with Lexie from her as well; meanwhile, death row inmate William wishes to donate his organs to Bailey and Arizona's patient, as Owen and Cristina try to go on their first date.