A singing cowboy stumbles across an ancient underground civilization beneath his ranch.

Wanting everyone off Radio Ranch, Beetson frames Gene.

The torpedo explodes knocking Gene unconscious; Queen Tika knows there is a traitor, and orders Gene brought back; Gene gets into a sword fight with guards; Frankie and Betsy are trapped by Beetson.

Gene tries to stop the radium bomb sent by the Queen to kill the riders on the surface.

Gene is pulled to safety, and the Queen is rescued; the ray goes wild, destroying Murania; the Queen orders all to the surface, where everyone and the ranch are safe, while staying behind herself.