Kandor, once the proud capital city of the planet Krypton, was stolen away from it's home planet and reduced in size by the spacefaring villain Brainiac. Intending to collect cities from across the galaxy to repopulate his homeworld, Brainiac placed the miniaturized Kandor in a protective glass bottle.

Many years later, long after Krypton had met it's fiery fate, Superman himself rescued the tiny city from Brainiac. The Man of Steel himself rescued the tiny city from Brainiac. The Man of Tomorrow brought Kandor and all it's inhabitants to this Arctic Fortress of Solitude. There, he has toiled away for many hours in the hope of someday finding a way to restore Kandor to it's original size.

As a lining remnant of Krypton, Kandor holds much interest for Superman. Fortunately, Kryptonian scientist Zak-Kul discovered a way to use the rare element Illuim 349 to shrink or enlarge individual people, making it possible for Superman himself to enter Kandor. Because Kandor replicates Krypton's gravity field, however, Superman loses his super-powers when he visits the city.

Still, Superman is a hero through and through; he and Jimmy Olsen have had many Kandorian adventures in which they adopted the roles of Nightwing and Flamebird, jet-propelled champions of justice.