(Ai Image made by @TomArtista) In the Mushroom Kingdom, E. Gadd creates a device that can send King Boo and Hellen Gravely to another world, one where they can't harm another soul again, until it ends up freeing them once more, trapping E. Gadd and Luigi as the two take over the Mushroom Kingdom. However, Luigi and E. Gadd find themselves in the land of Equestria, to where they meet a pony who's willing to help. It's up to Luigi and Twilight Sparkle to save the Mushroom Kingdom, only issue, it's far more difficult to stop the king of all boos then they think, and both their worlds are on the line...