An old scientist invents a machine that can transpose minds into other bodies but he makes the mistake of picking as his victim an ex-con on the way to meet with his parole officer.; Time-traveling government agents go back to the past in order to duel it out over a scientist's work.; A criminal is set free from jail if he agrees to a form of behavioral control by hypnotism ala "A Clockwork Orange".; Invisible visitors to Earth arrive in a flying saucer.; A man finds himself on a steamboat that transports him through time.; A fleeing dictator thinks he will hide out on an island and then fly back to the mainland when his pursuers have given up looking for him, but his associates have drained the plane of fuel.