When Mario and friends go to the mushroom city to retrive a secret weapon to defeat bowser once and for all, Godzilla king of the monsters shows up and wreaks havoc on the mushroom kingdom. After some failed attempts to stop the giant beast, Bowser, the great Koopa king and his armada of airships show up to destroy Godzilla themselves, however that ends with all the ships being destroyed. Bowser comes to the conclusion that he will eat the super sushi and stop Godzilla himself. Who will be crowned king of the monsters? Godzilla or Bowser?