Steed is entrusted with the safe-keeping of a new fuel formula when its inventor is found in a coma. The scientist had been involved in a black magic circle which leads Steed and Cathy into the world of hexes and magic powers.

A vastly strong, bullet-proof killer homes in on and destroys several electronics executives. Could it have something to do with Dr. Armstrong's automated work place? Or with the activities of a nearby karate school...

Steed is invited to a party, and finds himself trapped in a remote-controlled aircraft, with six fancy-dressed specialists in various combat styles, en route to a distant island. There, they are pitted against each other in a deadly test.