Oliver Crangle is a bitter, prejudiced man. Through unknown means he intends to shrink every evil person in the world at four o'clock. When four o'clock comes around, it is he who shrinks.
The series was a collection of various tales that range from the tragic to the comedic. They may be scary or just thought-provoking. Most episodes have unexpected endings and a moral lesson. But, no matter what, it's "a journey into a wondrous land, whose boundaries are that of the imagination".