Superman Fleischer Episode 16 Underground World Episode Title:Underground World.Episode Description: An explorer convinces Perry White to have the Daily Planet finance his expedition to caverns original discovered by his father, who disappeared over 40 years earlier while further exploring them. As part of the deal, he takes Lois Lane and Clark Kent with him to guarantee exclusive rights to the story. As the group ventures deep into the caverns, they come across an underground world inhabited by men with heads and wings resembling those of hawks.