Gwendy Peterson is a fictional character created by author Stephen King and co-writer Richard Chizmar. She first appears in the novella "Gwendy's Button Box," which was published in 2017. Gwendy is a young girl living in the small town of Castle Rock, Maine, who encounters a mysterious box that grants her the power to influence the world around her. The story explores themes of choice, responsibility, and the consequences of power. Gwendy's character is portrayed as intelligent and thoughtful, navigating the challenges that come with her newfound abilities. The narrative delves into her struggles and growth as she learns to manage the weight of her decisions.