Today is Princess Peach’s birthday, so her castle is full of presents. Mario and Luigi are there, and they’re celebrating with the Toads and Princess Peach when a huge birthday cake arrives. Who in the world could it be from? Suddenly, Bowser Jr. and minions jump out of the cake. Everyone is shocked and pandemonium ensues. In a flash, the invaders snatch Princess Peach and fly away in a giant Airship. The Toads are in a panic! Mario and Luigi—and Yellow Toad, Blue Toad and Yoshi too!—pursue the Airship in order to rescue Princess Peach. Together, the four head out on an adventurous journey!