As a mysterious villain calling himself "The Sheriff" terrorizes the city of Nottingham, the people that Robyn once liberated again need her help. But back on Earth, with the police searching for her, Robyn contends with problems of her own. Can Robyn harness the strength inside of her to rise up and be the hero that Nottingham needs, or will her demons get the best of her as she faces the consequences of her past actions?