Unlike Don't Starve, DST has no adventure mode and is purely a co-op survival mode. Therefore you cannot beat the game and defeat Charlie. I believe that Klei Entertainment will conclude the story with a new Don't Starve game rather than a DST update. The DST story creates a great scenario for a co-op survival game. The games have developed into a series that has many subtle peeks into the Don't Starve lore. These hints, along with animated shorts showcasing significant story beats, shift the game to a more grandiose scale, and the actions you and your fellow survivors make feel more impactful.