Princess Peach is held captive in her castle by Bowser, Bowser Jr., and the Koopalings who invade and use a giant mechanical arm to throw Mario, Luigi, and two Toads far away. Mario and friends must now travel across this new land returning to Peach’s castle in order to save her. On the way, they encounter seven Koopalings each controlling their own worlds, plus Kamek, Nabbit, Bowser Jr., and many minor monsters like Goomba. By conquering them, they get closer to Peach’s castle, which has been transformed into an evil reflection of Bowser. By defeating Bowser, the castle returns to normal. As the heroes celebrate, Bowser Jr. and the Koopalings attempt to escape, almost leaving Bowser behind. He manages to jump up onto the airship, but his weight causes it to crash, and they are forced to flee on Bowser Jr.’s Koopa Clown Car.