Superman #13
Superman discovers an underground civilization beneath Metropolis that has been using a ray apparatus to destroy buildings in Metropolis and elsewhere. He meets with Kyack and learns that this civilization once populated the Earth before the ice age, and the glaciers forced them underground, where they built their new civilization. Now they are planning an invasion of the Earth's surface and restore the rule they once had over it.
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Superman discovers an underground civilization beneath Metropolis that has been using a ray apparatus to destroy buildings in Metropolis and elsewhere. He meets with Kyack and learns that this civilization once populated the Earth before the ice age, and the glaciers forced them underground, where they built their new civilization. Now they are planning an invasion of the Earth's surface and restore the rule they once had over it.
Plot details indexed by the Grand Comics Database (CC BY-SA).