A timid, unimpressive man stays behind to witness an H Bomb test on an island with the guinea pigs figuring that any change will be an improvement. The bomb flash blinds and burns him, but when he recovers in the hospital, he finds that he has grown taller, powerfully built and handsome.
Mankind retreats from atomic horror to live underground for so many years that the past is forgotten and no one recalls why they had to leave the surface. One boy finds that he cannot be like the others and simply accept the situation so he takes the last remaining shaft up to the surface world.
An experimental psychologist conducting tests on hamsters has a dream wherein they become so intelligent that they escape their cages and turn the tables on him subjecting him to electric shocks whenever he attempts to leave the house.