Mario and Luigi, the twin plumbers, apply their “let’s-a-go” attitude to solve everyday problems all over their new home of the Mushroom Kingdom. As they support Princess Peach, and work to reform a miniaturised imprisoned Bowser, they meet a new companion – Yoshi. Princess Peach’s birthday party sparks a galactic adventure, sending the brothers into space to stop Bowser Jr.’s wicked ambitions and save Rosalina. The addition of the beloved characters Rosalina and Bowser Jr. adds extra spice of big action, comedy, and some shocking revelations to the adventure!