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.
as Gene Autry
as Frankie Baxter
as Betsy Baxter
as Queen Tika
as Lord Argo
as Mal
as Rab
as Prof. Beetson (as Frank Glendon)
as Oscar (as Lester 'Smiley' Burnett)
as Pete (as William Moore)
as Cooper (as Edward Piel Sr.)
as Saunders
