Finn and Jake have been busy building their own dungeon and saving the world, but something sinister is going on... Will they be able to save the day? It's always been the moon! When old friends and enemies sudden make a resurgence in Ooo, Finn and Jake know that something is about to go down... Between building their own dungeon and saving the world, the heroes might be stretched too thin. If they can't save the day, then who can?