Vic Torry and His Flying Saucer #1

Vic Torry discovers a fully operational flying saucer and takes it on a test flight over a mountainous region, where he encounters dangerous alien creatures called Ginzas that have been enslaving Earthlings. After defeating the Ginzas with the saucer's atomic weaponry, Vic learns that the craft belongs to an alien named Szizz, who plans to use it to conquer Earth with an army of robot ships controlled from the saucer. Vic must stop Szizz's invasion plot before the alien can launch his assault on humanity.