In the facts of a virtual boy port of Mario 3, Bowser puts the curse on him with a slimy thing before falling into the void and dying. This causes Mario to become violent and attack the kingdom so Mario goes with a toad to kill the being, the toad manages to get Mario's being out but due to an oversight he escapes, already in the forest he takes the form of Mario and He continues to threaten the mushroom kingdom as the reincarnation of Bowser, (he killed Mario after he attacked him with the black liquid and melted his face)