Super Mario Adventure II is an upcoming 4D Mario title for the Wii U and will be the sequel to Super Mario Adventure: Revenge of a Lost Koopaling. The title will be released on TBA 2014/2015. It will be developed by Metal Chaos Inc. and another company, and published by Nintendo. The setting of the game will be on Yoshi's Island. The main protagonist will not be Mario (who will be the second-main protagonist), and the main antagonist is a villain returning from the handheld Mario and Luigi RPG games.