A sailor meets a sea captain on a pier who tells him his fate is to run into a green fog concealing a giant white whale.; A reporter regrets getting his scientist friend to test out his invisibility ray on him when he detects non-human invisible creatures following humans around. When they detect him, they pursue him, and the reporter fears for his life. When the ray wears off the scientist tells him the creatures he saw must have been an effect of the ray, but the reporter doesn't believe so and expresses concerns as to what the creatures were.; A crook has a black box which links to the year 1791. When he drops a handgun into it, it shows up in 1791. His ancestor's wife takes the gun from him and drops it back into the box where it drops out onto the police station floor and the crook confesses to the robbery.; Two communist agents get taken for fools by a man disguised as a chemist who is actually the one that they are trying to arrest.; A man hears the story of a wooden idol which points to an expensive gem and gets his buddies to follow him to Africa. The natives shun the black raven as evil magic, and their luck seems to get worse and worse as they head deeper into the continent's interior, until his friends desert him to head back to civilization. He finds himself pursued by lions, and with a snake pit in front of him, he hurls the statue against the rocks where it breaks apart. When he does this, the lions turn away, but he sees that the gem was concealed within the statue, and it now rests at the bottom of the snake pit.; A man from the fourth dimension gets back home by paying an amusement park owner enough money to build a roller coaster with sufficient speed to propel him back whence he came.