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

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.

After defeating the guards, Gene reaches the surface and takes Beetson's airplane; the Queen kills the engine.

(Chapter 5)