Jax-Ur (Mackenzie Gray)

Jax-Ur is a Kryptonian scientist, war criminal (Kryptonian Civil War), and member of the Sword of Rao under General Zod, being one of the first great enemies of the hero Superman.

Together with General Zod, Jax-Ur attempted to re-establish Krypton on Earth by bringing about a terraformation apocalypse (in the Black Zero Event), but he was ultimately defeated by Superman and re-imprisoned in the Phantom Zone.