Mario and Luigi are content with their new life in the Mushroom Kingdom, but can't help but miss adventure. That is when Princess Peach tells them that Bowser Jr., Bowser's son, has arrived and is causing havoc across the kingdom. And so, Mario and Luigi set off to foil Bowser Jr.. Joining the Mario Bros. on their adventure is Yoshi, a Yoshi who hatched from an egg back in the Brooklyn sewers, followed the pipe to the Mushroom Kingdom, met Mario and Luigi, and grew fond of them.
