An explorer, Henderson, tells the Daily Planet editor and Clark and Lois about caverns his missing father explored. If the Daily Planet will finance an expedition, Henderson will give them an exclusive story. Henderson, Lois, and Clark prepare boats to raft into the Henderson Caverns. Clark will meet Lois and Henderson later using a separate boat. Lois and Henderson drift through several caverns then beach their boat. After getting out, their boat slips away and before they can catch it it collides with a cavern wall. Explosives in the boat blow up. Clark hears the explosion, and following in the other boat calls for Lois. Meanwhile, Lois and Henderson have been captured by humanoid bird people who live in a system of caverns opened by the explosion. Lois spots a statue that looks like Henderson's missing father. Clark approaches the opening to the new caverns, and soon sees the bird people are going to sacrifice Lois and Henderson in a burning pit. Clark changes to Superman and fights with flying bird people armed with spears. He defeats them, and at the last moment saves Lois and Henderson. Superman flies them out of the caverns then uses explosives to seal the bird peoples' caverns back up. Their editor burns their story saying noone would believe it.
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