When her archaeologist father disappears on an expedition, Wanda sets out to look for him. What she finds is a secret underground world, where no one...

When the ancient continent of Mu sank beneath the ocean, some of its inhabitant survived in caverns beneath the sea. Cowboy singer Gene Autry...

With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.