 When Superman is on Zod's ship, Ur manages to extract the Growth Codex (an ancient Kryptonian artifact that decodes the genetic makeup of the artificially incubated babies on Krypton, stolen by Jor-El who stored the Codex in Kal-El's DNA) from him.Jax-Ur is later sent back to the Phantom Zone, along with the crew, when a black hole is generated by the military.In the novel "The Last Days of Krypton," by Kevin J. Anderson, Jax-Ur is a historical villain in Krypton's past.