Two models, eager to make their names publicised and internationally-known in France, are killed in a dramatic staged monorail-train crash, while en route to the countries' capital Paris, and are rebuilt by the Mysterons, in a bid to assassinate Andre Verdain, owner of the ""House of Verdain"", a top modelling & fashion design company, which keeps his real occupation as the controller of the European Area Intelligence Service a confidential secret.

Captains Scarlet and Blue, along with angels Symphony and Destiny are assigned to act as French newspaper photographers and stunning, attractive models, in order to guard Verdain from any Mysteron attacks, but they are absolutely oblivious of the presence of the two female model doppelgangers.

This episode concludes from where Captain Scarlet, Captain Blue and Lieutenant Green left the remains of the Lunarville 7 compound, where before they discovered a brand new Mysteron complex being assembled in Crater Number 101 of the Humboldt Sea, situated on the far side of the Moon. The power source will also provide Spectrum with ample oppurtunity to somehow come into direct contact with The Mysterons themselves, to try and come to a peaceful settlement.

All 3 men volunteer to carry out a full-scale expedition by infiltrating the complex and removing its power source, so it won't become of any harmless use and so the Mysterons will not be able to reconstruct the whole complex after it's destruction.

However, the bomb which is transported to destroy the entire complex is set for 10:00 S.E.T. instead of the agreed Midnight deadline, by a Mysteron agent, disguising himself as a technician officer of Lunarville 4, the space-base that equipped and informed the 3 Spectrum officers, in ord

Concluding from where Crater 101 left of, Spectrum take a chance by commencing a maximum security operation to bodyguard radio communications expert, Doctor Kurnitz, from the Nash Institute of Technologies, up to Cloudbase to send a broadcasted voice message by Colonel White to the Mysterons base on Mars, in an effort to solve their differences, and to end the raging war of nerves between them.

But the Mysteron pulsator stolen by Captain Scarlet during the expedition at Crater 101 is used as an explosive charge, to start a chain reaction on-board Cloudbase, which will no doubt utterly destroy the aerial base, and with Scarlet drawn away by Captain Black to prevent him from saving his fellow officers, the world-security organisation known as Spectrum, is condemned to be crippled.

Once again, the Mysterons target the Spectrum Angels in their latest act of retaliation, but it isn't actually one of the Angels, it's one of their home cities.

Receiving a report from a biological research station on the outskirts of Manchester, England, regarding the theft of the phial of the K-14 virus. This is a revolutionary, & brand new strain, that has the capability to kill 10 million people. Captain Scarlet and Captain Blue start a timed race to find the station's research assistant suspsected of the theft, who is the only person to be granted access to it, Judy Chapman.

Assessing that the forces' target is the Boulder Dam of Los Angeles, which the city's name stands for ""The Angels"", Scarlet places his non-indestructible life, in this particular case, on the line, to recover the phial, although he to faces imminent death.

Mervin Brand, a reporter for The Tribune newspaper, is killed in his jet by thunder-lightening while en route to the press conference with President Roberts. When reconstructed promptly by the Mysterons, so Tribune Control don't suspect that the real Mervin Brand has crashed and died, the Mysteron Brand continues his flight to the press conference, but is stopped in his tracks by the Angels, who have strict instructions to attack & destroy any aircraft violating the restricted airspace over the President's residence, due to his life being under siege by the Mysterons.

His arrogance and egotism doesn't assist matters, as he believes the enemy foes preparing to kill him will not achieve their latest ploy of revenge, and ignores the fact that the Mysterons killed the Director-General of the United Asian Republic.

Spectrum continue to secure his residence, but when the President reveals the new atomic-liner ship, built by the Trans-Pacific Shipping Corporation, is being named after him and

While relaxing at a smart countryside restaurant during a late evening, Captain Blue, accompanied by Captain Scarlet, starts to feel strange after drinking a cup of black coffee.

When Scarlet goes to fetch their coats, Blue instantaneously disappears, and when awakening, finds himself sitting in Lieutenant Green's chair back on Cloudbase, with a Spectrum Intelligence agent, who calls himself Colgan, sitting in Colonel White's chair.

He explains that Blue has been absent without leave for three months, and must prove his identity by disclosing top-security information; the Spectrum cipher codes, before he can return to active duty.

Without having to do this, Captain Blue instead story-tells three Spectrum assignments involving the Mysterons: the nuclear attack on London, the mission of destroying the Mysteron complex in Crater 101, and the prevention of a Mysteronised Commodore and his aid from slaughtering the Supreme Command of the World Air Force at the Scottish Glen Garry