A scientist uses a device that makes the particles of a living body move at the speed of light, rendering him invisible to the eye. He conducts a series of stunts in order to build up a name for himself so he can them go public and cash in. After forty days he glances into the mirror and realizes that he has aged forty years during that time due to a side effect. He realizes with the little time left to him that he can no longer use his knowledge for selfish gain.; A scientist working on a matter transporting device accidentally transports himself to a distant planet of warlike aliens. They read his mind in order to use his device for conquest. He steals back their record of his thoughts and escapes back to Earth, where he destroys his machine to prevent anyone using it to invade.; A scientist tracks down a sea serpent, but the crew of his ship panics and kills it. When they try to recover the creature's body they discover that it was an alien trying to communicate with humans after crash landing on Earth centuries ago.; A scientist's assistant uses a time machine to travel to the past in order to find a pirate's treasure and get rich. While in the past he is attacked by the pirates, and unknowingly kills one of his own ancestors, erasing his own existence.