Bowser has returned to the Mushroom Kingdom after a long absence since the first Mario movie and takes away Princess Peach again to the birth of his new galaxy. The Mario Bros try to stop him and rescue Peach but gets wiped out and sent flying off the face of the planet. They are recovered by the mysterious princess of the stars, Rosalina who helps them on their path to Bowser's Galaxy by collecting the power stars from all over the universe. Meanwhile, Princess Peach finally discovers her true origins.
