An apparent murder-suicide in a hospital emergency room leads to an investigation by the on-call doctor, which reveals a plot by an insane toymaker to kill as many people as possible during Halloween through an ancient Celtic ritual involving a stolen boulder from Stonehenge and Halloween masks.

In 1982 legendary British heavy metal band Spinal Tap attempt an American comeback tour accompanied by a fan who is also a film-maker. The resulting documentary, interspersed with powerful performances of Tap's pivotal music and profound lyrics, candidly follows a rock group heading towards crisis, culminating in the infamous affair of the eighteen-inch-high Stonehenge stage prop.

Executive transvestite Eddie Izzard takes his show to San Francisco to give a brief history of pagan and Christian religions, the building of Stonehenge, the birth of the Church of England and of Western empires, and the need for a European dream. Along the way, he dramatizes Dr. Heimlich's search for a maneuver, the naming of Engelbert Humperdinck, Scooby and Shaggy as archetypes, Neil Armstrong on the moon, society's tolerance of mass murderers, how we sing anthems and carols, Hollywood...