When brothers Mario and Luigi end up with a big plumbing problem underneath their hometown in Brooklyn, they're suddenly sucked away and separated into a world beyond their wildest dreams. Mario ends up in the Mushroom Kingdom, a beloved kingdom ruled by the beautiful and frondeur Princess Peach. But when they find out that the monstrous reptile named Bowser has taken a Power Star, along with holding Luigi and one of the princess's noble knights, (Y/n), hostage, it's up to Mario, Princess Peach, and their small but loyal sidekick Toad, to team up with their allies, and rescue their friends before Bowser takes over the world.