The first half of this film, set hundreds of years ago, shows how the old man who eventually became Santa Claus was given immortality and chosen to deliver toys to all the children of the world. The second half moves into the modern era, in which Patch, the inventing elf, strikes out on his own and falls in with an evil toy manufacturer who wants to corner the market and eliminate Santa Claus.

A demon who seeks to create eternal night by destroying the last of the unicorns and marrying a fairy princess is opposed by the forest boy Jack and his elven allies in this magical fantasy. Two different versions of this picture feature soundtracks by either Tangerine Dream or Jerry Goldsmith.