"Revenge" ended with a number of surprising cliffhangers, including the reveal that Emily's mother is still alive. More characters will also be joining the primetime soap, but casting decisions haven't been made quite yet.
TV Guide floated the ideas of Elizabeth Mitchell, Heather Locklear, and Marg Helgenberger. She'd need to be someone damaged enough to be convincing as the mother of Emily Thorne, played by Emily VanCamp. Mike Kelly, the executive producer, said, "There will be a hunt for her, and she won't be easy to find. She's been gone, deliberately, for a very long time. Emily is one messed-up girl, and she's going to find out the apple didn't fall far from the tree."
Maybe one of the "Desperate Housewives" alumni could take the role now that they're free. (I'm thinking Marcia Cross or maybe Nicollette Sheridan.)
Who do you think should play Emily's long-lost mother dearest?