Professor Gabriel Carney, an awarded scientist for designing original electronics, is assassinated at his own gadgets-fulfilled home by Captain Black, in order for the Mysterons to use his skills and knowledge of the hi-tech subject to kill the three joint presidents of the Congress of Europe, additionally recognised as The Triumvirate of Europe. The names of those three men are: Conrad Olafson, John L. Henderson and Joseph Meccini, and this specific trio of men are apparently dubbed the most powerful figures on Earth, after the World President.

The Mysterons elect Conrad Olafson as the first to be killed, whom is located in an underground suite, 40-feet underground Vandon Base, a maximum-security centre where plentiful Spectrum security personnel are scattered over, and in addition, the Angels commencing repeated aerial patrols over the area and Captain Ochre acting as the officer in charge of security.

Their attention is diverted instantly by a realistically audible incoming military