In his evil plot to take over the Mushroom Kingdom, Fawful tricks Bowser™ into eating a magic mushroom. The mushroom causes Bowser to begin inhaling everything around him, including Mario™, Luigi™ and Princess Peach™! Do the Mario Bros. have the guts to rescue Peach and escape? Players are in control of two separate storylines. One features Bowser and his efforts to stop an arch-villain from taking over his castle. Meanwhile, inside Bowser, the microbe-sized Mario & Luigi must muscle their way...