Mario and Luigi are celebrating their 1st anniversary in the Mushroom Kingdom, but when Bowser and Bowser Jr. escape prison thanks to their long lost kids, The Koopalings, along with new hires, Wario and Waluigi, Princess Peach and Tiara get captured! It’s up to Mario, Luigi, Toad, Yoshi, Rosalina, along with newcomers Daisy and Cappy to stop Bowser from merging the Mushroom World with the Real World.
