In Super Mario Bros. Z it is likely to be the location of a Chaos Emerald, as references to it have been made to it in the Anime-opening and Episode 7. More specifically, the world's tyrant, Wart, along with his Ninji followers were seen briefly in the opening and Kolorado stated that he wished to begin an expedition to Subcon. Furthermore, Kolorado's watch originated from this mysterious dream land, which is possible for him to go there again too.