The Mysterons second target is the Director General of the United Asian Republic. Spectrum swings into action to protect him as he prepares to board his private plane at London Airport.

The Mysterons threaten to destroy London and a truck carrying an atomic device goes missing and is hidden somewhere in the city. The only clue to its whereabouts is the truck driver, found unconscious in the street.

A manhunt begins for former Spectrum agent Captain Black after a failed break in at a nuclear power plant, where he is accidentally exposed to radiation and becomes detectable for 48 hours.

Spectrum and the World President attend a secret conference on an African game reserve to demonstrate two new anti-Mysteron gadgets, a Mysteron Detector and a Mysteron Gun but the aliens announce they intend to sabotage the event.

The Mysterons threaten to obliterate the continent of North America, but Spectrum is left without its number one agent when Captain Scarlet is dismissed for gambling offenses.

As the Mysterons threaten to destroy the "Heart of New York", Captain Scarlet and Captain Blue investigate the theft of Grade A Security documents from the Spectrum security vaults.

When the Lunar Controller claims he can negotiate peace between the moon and the Mysterons, Captain Scarlet, Captain Blue and Lieutenant Green are sent to the moon to investigate.

Captain Scarlet, Captain Blue and Lieutenant Green volunteer for a dangerous mission to remove the power source of the Mysteron complex inside Crater 101, on the far side of the Moon, before it is destroyed by a low yield atomic device.

Captain Scarlet and Captain Blue are sent to observe an operation to obtain vital orbital reconnaissance photographs of Mars. But the project is put in danger when one of the astronomers is taken over by The Mysterons.

Using the Mysteron pulsator recovered from the complex in Crater 101, Dr Kurnitz has developed a transmission device with which Colonel White attempts to contact the Mysterons and sue for peace.

Captain Black engineers the death of chief test pilot Major Gravener, who is retrometabolised as a Mysteron agent as part of the Mysterons' plan to destroy the World Capital, Futura City.

When the Mysterons threaten to sabotage a vital conference at Lake Toma in Switzerland, Scarlet and Blue are assigned to escort the world's leading astrophysicist, Dr. Conrad, to Geneva.

Tritonium alloy mining operations at Hotspot Tower in the North Pole are threatened when a Mysteron agent cuts the power to vital heating elements.

Captain Scarlet and the rest of Spectrum are in a desperate race against time to defeat the Mysteron's latest threat, the total destruction of the massive desalination plant at Najama, high in the Andes Mountains.

After a series of suspicious Spectrum hovercraft crashes, Captain Scarlet and Captain Blue are sent to the Australian Outback investigate if the Mysterons claims that their is a traitor in Spectrum is true.

Spectrum personnel inexplicably take leave of their senses, due to drinking some champagne drugged by the Mysterons, who have threaten to destroy the World Navy Complex at Atlantica.

After the Mysterons threaten Spectrum's Cloudbase headquarters, a large fast-moving trace appears on the radar.

Captain Blue disappears from a restaurant. He awakes to find it is 3 months later and Spectrum Security want to know where he has been, and if he is even the real Captain Blue.