Every Brainiac's domed city is equipped with its own gravity field generator
Superman handles Kandor very carelessly when he makes off with both cities. So carelessly he could have killed the Kandorians accidentally. They had to be protected by a force field.http://tvtropes.org/pmwiki/pmwiki.php/WMG/SupermanBrainiac
FollowingWMG / Superman: Brainiac
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