In pre-Crisis continuity, Zor-El was a climatographer on Krypton, and one of the only scientists to believe his older brother Jor-El's predictions about the impending destruction of Krypton. When the planet exploded, Argo City was somehow blown safely into space with a life-giving bubble of air around it (a later version of the story in "Action Comics" #316 (September 1964) has the city saved by weather dome that Zor-El had constructed). The explosion had turned the ground beneath Argo City into Kryptonite, but Zor-El and the other survivors covered the surface with sheets of lead. The Kryptonians managed to keep alive for many years, and Kara was born a short time after the destruction of Krypton. The end for Argo City came when a meteor storm punched holes into the lead sheeting, exposing the survivors to the deadly kryptonite radiation. Zor-El managed to build a rocket and use it to send his daughter Kara to Earth. Fearing that Superman would not recognize her because he had left Krypton as an infant, Kara's parents provided a costume based closely on the Man of Steel's own.