Challengers of the Unknown #29

Synopsis

Dr. Dutro and the alien Suboko warn the Challengers that an invasion force has placed four machines across the planet to trigger natural disasters and soften Earth up for invasion. The Challengers try to destroy the devices, but can only move them. When they return to Challenger Mountain, they learn that Dr. Dutro was a fake and that Suboko works for the invasion force and that the devices protected the Earth. The Challengers restore the devices to their spots, despite an attack by aliens on camels with ray guns. They use the last device to drive the aliens back until the Space Police arrive.