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When Mario, Luigi, Princess Peach, and Toad came through a third warp pipe, Mario was so angry over having to go through another world that he shot a monster named Hisstocrat. The creature then dropped a Double-Cheery power-up and Mario proceeded to eat it, thus Mario's clone was born. The clone shares Mario's behavior, cravings, and intellectual disability. The plumber is happy to see his clone (unintentionally forgetting about Luigi's existence), which annoys Toad, considering that one Mario was already bad enough.
When Bowser appeared, the gang immediately fought him, with the clone joining in. Both him and Mario ground-pounded Bowser's face, much to the Koopa King's surprise as there are two Marios. Upon Bowser's transformation into Meowser, he shot a fireball at Mario, but the clone, not wanting his "brother" to die, sacrificed himself and was burned to death. His final words were "I'll always be right here." in which he was pointing to Mario's heart.