Supergirl’s Helen Slater (more recently seen in guest stints on the likes of Smallville, Greek, and Grey’s Anatomy) has been cast as an upper-crust mom in ABC Family’s pilot The Lying Game, EW has learned exclusively. She’ll play Kristen Mercer, the wealthy adopted mother of a teen girl named Sutton. Based on the book by Pretty Little Liars author Sara Shepard, the series revolves around Sutton and her long-lost twin, Emma, reuniting to find their birth mother – until Sutton goes mysteriously missing.
Posted November 24 2010 — 2:50 PM EST
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