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 develop...
據《魯迅日記》，魯迅于1935年10月21日，同王河清、許廣平同至麗都大戲院，觀此片上集，10月23日，與許廣平至麗都觀此片下集。當時譯名爲《電國秘密》。
Los vaqueros de Radio Ranch van a la ciudad subterránea de Murania. Adaptada de la serie "The Phantom Empire."
