A scientist figures out how to switch bodies with a homeless man, but both men end up dead.; An unnamed gangster tries to escape the police by forcing an old man to take him to another state. The old man turns out to be from the future and is looking for a male specimen to put on display.; A man ventures out to a mist-hidden island that has curative properties in order to marry a couple there.; The Martians force anyone wanting to trade with them to solve a puzzle. All of the scientists sent there fail, but the ship's steward realizes that the trick is done with a simple treadmill.