 Jax-Ur's intention was to launch a nuclear missile to destroy a passing space rock.If this test proved successful, Jax-Ur would then commence the build-up of a massive, privately held nuclear arsenal with which he would overthrow the Kryptonian government, and place the entire planet under his dominion.In the "World of Krypton" miniseries, his missile collided with a spaceship piloted by Superman's father Jor-El and went off-course to destroy Wegthor.