Page "Krypton (comics)" Paragraph 17

The Silver Age Superman was not alone in the survival of Krypton's destruction, being joined by his cousin Supergirl, the Phantom Zone criminals, Beppo the super-monkey, Krypto the Superdog, a juvenile delinquent named Dev-Em, and the entire population of the city of Kandor, Supergirl's real parents and even Superman's real parents ( in hibernation on a space ship-Superboy # 158 July-1969 ), When the planet exploded, one entire city of Krypton, Argo City, survived the cataclysm.