Mario sets out for Isle Delfino for a vacation with Princess Peach, her long-time steward Toadsworth, and several other Toads. Upon a rough plane landing at the island's airstrip, the group encounters a goop-covered piranha plant. Mario finds a Flash Liquidizer Ultra Dousing Device or F.L.U.D.D., a powerful water cannon that is toted like a backpack to defeat the monster. As soon as he does so though, two police officers arrest him. He is taken to court the next day. They find that the once-pristine island has been polluted and plastered with graffiti. As a result of this pollution, sun-shaped objects called "Shine Sprites", the island's sources of power, have disappeared, and the island is covered in a perpetual shadow. Despite Peach's objections, Mario is convicted and sentenced to clean up the graffiti and recover the Shine Sprites. The next day, Mario begins his efforts to restore peace to Isle Delfino, track down the real criminal, and clear his name.