A man threatens a witch unless she hands over two lenses which will make him invisible. She implores him not to try it, but relinquishes the lens. They can be reversed to make the invisible visible once again, but what the man did not expect is that when he becomes invisible to the outside world, the outside world in turn becomes invisible to him.
A scientist's longevity serum gives him a lifespan of a thousand years, but he finds this a curse as he watches his friends grow old and die while he remains alone and Earth becomes overpopulated. When humanity begins to leave Earth he refuses to go, and is surprised when one other person, a young woman, also decides to stay allowing the two strangers, Adam and Eve, to restart humanity.
A martian is sent to Earth to kidnap a human scientist who has invented a weapon that Mars wants to use against Jupiter. The Martian is beaten by the scientist, who turns out to be a Jovian agent setting a trap to capture a live Martian.