Chris and his crew respond to a distress call from a sub-atomic world, where they liberate the population from an oppressive tyrant.; A scientist makes a criminal invisible and when the crook becomes bored with theft, he begins to invisibly aid the police.; Physicist Hiram Sprague develops a force field to protect cities against atomic attack and accidentally cuts off his city from the outside world.; Ordinary, average man, Roy Wilkins, glimpses the future and discovers that he's destined to become famous.; Benedictus invents saftey glass.; A young man learns what the professor means by "travel."; The facts about the discovery of binary stars.