Men with Steel Faces

Thousands of years ago, survivors of the ancient continent of Mu built a technologically superior civilization below the ground of radio singer Gene Autry's radio ranch. He accidentally finds the city, but he must still broadcast each day to keep the ranch from being foreclosed on. Scientists come to the ranch for the area's high supply of uranium, while some Murians plot a coup of their Queen. Add to this two local kids with a sci-fi club (Darro and King), who end up getting captured by the Muranian's, and it's all up to Gene to save the radio ranch, his friends, his fellow men, the Queen and the Muranians.