The image of Cooper Ridley flashes on television screens all over planet Earth. Ridley warns of an unimaginable danger, a threat to all Earth's creatures.
Azrnoth-zin, Mara-jul and the Displaced Alien Work Force join Ridley to convince the world’s leaders to unite against this deadly menace. Cooperation is not forthcoming.
Using secret contacts and brilliant disguises, the Phoenix Project surfaces in a final attempt to seize alien technology. A near fatal encounter occurs at the United Nations building leaving the Phoenix Project exposed. Duped by her own cabinet, The President and her family are taken hostage.
Earth friends, the Dutchman and marine biologists Doctors Darcy Billings and Teresa Gamez, become involved and, along with Ridley and his small group of aliens, are the only deterrent to the Trochinids. In an undersea base nearly two miles down, the marine biologists and a team of scientists work frantically to discover a weakness in Trochinid physiology.
Under attack at Pisaster base, Darcy, Teresa and Mara-jul make a discovery that may turn the tide of the war. In the final moments, they place all their hopes on a strange phenomenon in the SOFAR channel. It is Earth's last hope.