Preview Clip of Season 9, Episode 12 Sneak Peek: Derek vs. Dr. Cahill (VIDEO) Tweet January 24, 2013 at 10:41AM EST by Rebecca Martin Related: Grey's Anatomy, Sneak Peeks , Derek Shepherd , Owen Hunt , Season 9 , Season 9 Episode 12 Credit: Video Still Grey's Anatomy Season 9, Episode 12: "Walking on a Dream" (January 24) is going to introduce a new face to the hospital: Dr. Cahill (Constance Zimmer). She's here to make things run more efficiently, and the docs are not a fan.
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