The Phantom Empire

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.

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

The Baxters leap to safety but are captured, and brought to Murania; Gene is unable to help, as the door control is disabled; the Baxters switch the door control, but get hit by radium rays.

The Baxters find Gene in time to save him; Argo orders the death of all surface people; battling, Gene arrives to where the Queen is being executed, but is knocked into the path of death-dealing rays.