 Jax-Ur would later redeem himself somewhat by helping Superman defeat Black Zero, the alien saboteur who ensured Krypton's destruction under the orders of the Pirate Empire.It is shown he has a code of honor, as Kryptonian criminals swear by a master criminal who escaped a prison to help each other.Struck by a red kryptonite bullet that Black Zero had created, Jax-Ur began mutating through a series of serpentine forms, until he became a Medusa-like creature, and turned Black Zero to stone with his gaze before the villain could destroy Metropolis in revenge for Superman foiling his plan to destroy Earth.