Jack Armstrong

Heading an aviation company that develops atom-powered motors, Jim Fairfield (Pierre Watkin) learns from his chief scientists, Vic Hardy (Hugh Prosser), that cosmic radiations are

The heroic trio escape when the door to the trapped room is blown open by the force of the explosion. By triangulating the cosmic rays, Jack determines the the experiments are taking a toll.

Jack Armstrong saves himself and his friends by forcing the plane into a a belly landing. Jason Grood (Charles Middleton), owner of the island's trading post and the brains behind it.

Jack and Betty are saved from the fiery pit by Umala (Russ Vincent), a native who now realizes that his enemies are the white men working for Grood. The latter orders his henchmen to do his bidding.

Jack and his friends land on a rocky ledge and make their way to the ground below. Meanwhile, Grood plans a fantastic demonstration to impress the natives.

As the aeroglobe settles in its berth, Jack and the Fairfields flatten themselves against the walls of the pit and escape death. Princess Alura, is believing Xalta.