A scientist develops the means of murdering everyone on the planet, but commits suicide after hearing a knocking on his door figuring that it is Martians come to place the only living human in a zoo. It turns out to be a tree branch in the wind.
In 1973 the first landing on Mars retreats quickly after Martians toss flesh dissolving grenades at them. They bring one back to Earth and it is stolen by a communist spy. He takes it back to the communist leaders where they open it and all die.
A man becomes wealthy by accusing his neighbors of disloyalty to the Red Chinese and sharing in the redistribution of wealth. Various soldiers pass through the area looking for traitors until there is no one left to accuse. When the last general asks who is wealthy, his neighbors point to the man and he is executed.