Flint has completed the rocket ship begun by his father and is ready to take off for Mars, but first has three prison convicts freed to serve as his crew. They land on Mars and find the corpse of a former explorer, who leaves a letter warning anyone finding his note to stay away from the dark side of Mars.; The loss of several Solar Ships forces the President of the Solar Congress to appoint Captain Cole to lead a force against the enemies from outer space. They are captured and the dictator, Zan, intends to turn them into dehumanized robots.; A former Earth scientist takes up residence on a far distant planetoid, and threatens to rule the universe and destroy all traces of civilization. His forst target is the Planet Pluto, which he attempts to pull from its orbit by a strange infra-red ray invention of his.; Spurt and his companions must fend off the attacks of the Luzerons, who occupy the polar regions of the Moon, and who are in the business of robbing interplanetary transports.; After a rocket ship crash that kills his parents, Auro is raised by a saber-tooth tiger. He is approached by a young woman named Martha to help save her friends who have been taken as slaves by the fiendish ruler of Neptune.; While the public is amazed and elated that no crimes have been committed for two weeks, the Police feel that their jobs are less secure because of the crime busting activities of the Red Comet. His magical powers seem to draw him like a magnet to the criminal element, and he has rounded them up with amazing speed, taking each to a different uninhabited but inhabitable planet in the universe and dropping them off to fend for themselves.; Buzz and his crew must face the Sharkmen, semi-intelligent living under the murky waters of Neptune, who have captured Dr. Curan and other members of his Neptune expedition.