Years have passed since ALIE's defeat. Clarke lost people along the way, some she cared for more than others. And so Clarke now lives alone in the depths of Trikru territory. But she didn't care what others said when the only thing expected of her was only what she expected of herself. But her past always had a way of catching up to her, especially when it involved the Commander.

Nuclear war ended life on Earth. Survivors lived in a space station called the Ark hoping Earth would become safe again. After more than a century time was running out for the Ark. Volunteers - including Lexa - were sent to the ground to discover if humans could return home. But what Lexa found shook her beliefs to the core and set her on a path of life and death, love and hate.