Why is Derek's sister coming to Seattle Grace on Thursday's Grey's Anatomy?
It turns out, each of his sisters were called to possibly donate a live nerve for the surgery on Derek's (Patrick Dempsey) hand. It looks like Neve Campbell, who will play Derek's previously unseen sister Lizzie, is the lucky winner!
So, will Lizzie's nerve save Derek's hand? Check out the sneak peek below, which features the Scream alum's introduction:
Grey's Anatomy airs Thursdays at 9/8c on ABC.