When a family come into possession of a statue called The Grinnygog, a trio of benevolent witches are summoned to the village where they live.

Mythos is a three-part documentary that consists of a series of lectures given by Joseph Campbell. Campbell conceived of the original lectures, filmed over the last six years of his life, as a summation of what he had learned about the human mythic impulse, in terms of psychology, ethnology and comparative mythology—what he called "the one great story of mankind."