A spaceship from another universe comes to the earth to conquer it. The alien's ship runs on sexual energy, so to power it and take over the world, they make sex slaves out of part of the population, then instigate a worldwide orgy.

Sardu, master of the Theatre of the Macabre, and his assistant Ralphus run a show in which, under the guise of 'magic', they torture and murder people in front of their audience. But what the punters see as a trick is actually real.