Spectrum Intelligence impart Captain Scarlet with a ""special assignment"" which is to consciously loose inadequately at a casino, and to place himself on their debt owners list for 5,000 credits. When this is reported to Spectrum Headquarters, Colonel White fires Scarlet on the spot, for improper use of the organisations' code of conduct, and his occupation taken away from him.

Living in a inexpensive, shabby hotel room temporarily, a pair of Mysteron agents, posing as sought after gangsters, formulate a deal with the now Paul Metcalfe, with his I.O.U. for 5,000 credits, in return for a Spectrum Pursuit Vehicle, which will be utilized to brake into the Nevada Nuclear City Complex, with an atomic incendiary device, which will obliterate the whole of North America.

An SKR-4 recovery vehicle is sent by the Euro-Space Tracker Station to destroy a live rocket, containing a malfunctioning destruct system, but ends being blown out of orbit and completely destroyed, when it collides with a considerably large meteorite.

Re-produced and controlled by the Mysterons, it becomes the bombing weapon, which will accomplish the forces' newest target: the Najama Complex, a vital colossal desalination plant, situated by the foothills of the Andes mountains. Its purpose is to process seawater from the Pacific Ocean, and irrigate the interior, and without it, hundreds of square miles would regress to waste land.

The complex is automated and requires very few personnel to administer the process, however it consists of vulnerable tanks, each containing liquid oxygen which would turn the whole valley into a ""blazing inferno"" if attacked with strong force.

While the complex personnel are evacuated, Captains Scarlet, Blue, Magenta and Ochre are sent to set-up surveillan

The Spectrum Cloudbase officers host a non-permitted party, excluding the ultimately strict Colonel White, to celebrate the 1st anniversary of the world-security organisation, with the assistance of an anonymous well wisher supplying the champagne, which has in fact been spiked with an organic compound which causes sporadic amnesia and general irresponsibility.

After being severely cautioned by the Colonel, whom discovers the party and becomes very angry at his personnel for not receiving official permission to celebrate the anniversary, the Mysterons announce their intentions to destroy the World Navy Base of Atlantica, an invulnerable underwater complex protected by sea-to-air rockets and offensively-equipped submarines.

Captains Blue and Ochre are handed the assignment to disband a wreckage which is being carried by heavy currents towards the Atlantica base, but the champagne has already taken control over them, turning them into juvenile rebelists.

Captain Black manages to changeov