Lost city explorers find mutants, cavegirls, dinosaurs and a leather clad space queen.

When the ancient continent of Mu sank beneath the ocean, some of its inhabitant survived in caverns beneath the sea. Cowboy singer Gene Autry stumbles upon the civilization, now buried beneath his own Radio Ranch. The Muranians have developed technology and weaponry such as television and ray guns. Their rich supply of radium draws unscrupulous speculators from the surface. The peaceful civilization of the Muranians is corrupted by the greed from above, and it becomes Autry's task to prevent all-out war, ideally without disrupting his regular radio show.

Merel and Mattis search for the plans for a fourth Death Star, but are stranded on the planet Taboo, where they confront Sith Lord Jonathan. But, what movie is this? Star Wars? Lord of the Rings? Jurassic Park? Nobody knows for sure.