 Background details are culled from other Krypton stories.This same story was retold in the animated series "Justice League Unlimited" in an episode by the same name and several elements were used in the "Supergirl" series episode "For the Girl Who Has Everything".One of Krypton's moons, Wegthor, was accidentally destroyed by the Kryptonian scientist Jax-Ur, who was experimenting with a nuclear missile that was diverted from its intended destination.