As Sansa Stark on Game of Thrones, Sophie Turner has to deal with more than her fair share of miscreants and monsters, but in the new movie Another Me, Turner may face her most dangerous foe yet … herself. Isabel Coixet directs this psychological thriller, which casts Turner as Fay, a normal teenage girl who starts to fear she's being followed by someone who shares her face. And as you'll see in this exclusive trailer, Fay's dopplegänger isn't interested in becoming BFFs — instead, she'd rather steal Fay's life entirely. (And you thought Joffrey was bad!) Costarring Rhys Ifans, Gregg Sulkin, and Jonathan Rhys Meyers, Another Me opens August 22; press play below to preview the intense Sansa-on-Sansa action.