Set one year after the events of season 3, Will and Robot set off to explore a new planet. Little do they know, that this planet holds more than one dark sercret. Secrets that have to do with Robot's past. And as a remorseful soul seeks revenge, Will is desperate to show everyone that Robot is not the heartless killer he was before. And as Robot copes with his past sins, he'll need Will more than ever. But will it be enough to save Robot from his past?