In the pursuit of perfection, an alien civilization has evolved to become beings of pure light energy, unbound by the limitations of the mortal body. But they have lost something precious along the way: the ability to experience physical pleasure. They send a representative to Earth to record human sensory experiences. Taking the form of the perfect human female, "Kara" uses her powers to unlock the secrets of sensuality so long forgotten on her world.

On a hiking trip in the Italian Alps, James discovers an ancient burial cave filled with gladiator artefacts. He becomes possessed by the spirit of Tyranus, a demon gladiator, and goes on a killing spree to revive the true spirit of Demonicus. A professor, Gina, and her students are to be the sacrifices to the demon Tyranus. Can they outwit Demonicus before becoming offerings to the evil god?