Seeking well-deserved rest and relaxation, Mario™ and Princess Peach travel to a beautiful remote island. It is said the local citizens are friendly and the weather forecast suggests year-round sunshine. However, when they get to the island, they quickly find out that the peaceful paradise has been polluted by a mysterious stranger. Worse still, the individual bears a striking resemblance to Mario! Determined to clear his reputation and clean up the island, Mario sets off on his greatest adventure yet.