Vyndktvx was a court jester in the 5th dimensional land of Zrfff, where he tried and failed to entertain the king with the hopes of winning his daughter, Princess Nyxlygsptlnz. When Mxyztplk appeared he amused both the king and princess with his multitude of tricks. His best trick was to prank and fool the superheroes of various three-dimensional worlds, which was highly entertaining to the King, since the 'tricks' tricked back. All of the worlds he attacked were destroyed, except for two which resisted, including Earth. ("Superman and the Men of Steel", "At the End of Days")