Sneaky Martians disguise themselves as the dead loved ones of astronauts in order to slay them in their sleep.; Rocketship #269 is approaching a gigantic planet with a density 50 times that of the Earth, and decide to circle it to take a closer look. They spot and decide to land on a satellite moon of the planet.......with dire results!; Feeling that he had already lived the exact moment before, Calvin tells his wife that he believes that there exists a parallel world which duplicates exactly everything happening at the current time. He plots to go to this parallel world and murder his counterpart so that he alone can control his own destiny.