Martians threaten to invade Earth, but an intelligent human intimidates them by demonstrating his mastery of the strongest animals on Earth.; A man gains powerful psychic abilities from his parents’ exposure to radiation, and he is hunted by the government until a hidden group of like-powered people contact him and bring him to their community.; A robot army invades Earth, but they are forced to retreat by rusting the first time it rains.; Alien conquerors create a sentient gas and send it to Earth to mentally enslave a human in order to test their readiness for conquest. The gas accidentally possesses a ventriloquist's puppet, and is trapped, unable to control the mindless vessel.; A screenwriter pitchs a director a movie theorizing that haunted houses are the arrival points for time travelers from the future, but he thinks the story is too far-fetched. The writer is relieved, since he is such a traveler and his secret is therefore safe.