Mario has a dream of a staircase leading to a door to another world. A voice identifies the world as the dreamland of Subcon, and asks for Mario's help in defeating the villainous frog named Wart, a tyrant who has cursed Subcon and its people. Mario suddenly awakes and decides to tell Luigi, Toad and Princess Peach, who all report experiencing the same dream. The group decides to go on a picnic, but upon arriving, they discover a cave with a long staircase. Through a door at the top, the group gets transported to Subcon, revealing their dreams to have been real. After defeating Wart, the people of Subcon are freed and the group celebrates, but Mario suddenly awakes in his bed, unsure if the events that took place were real or just a dream.