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.

When the Mysterons threaten to destroy key links in the Frost Line Outer Space Defence System, Captain Scarlet and Lieutenant Green race to investigate the mysterious deaths of the personnel at Red Deer Base.

Mysteron agent Judith Chapman, steals a phial of deadly K14 virus - enough to kill ten million people - from Biological Research Station with the intent of poisoning a unknown cities water supply.

A truck carrying an atomic core reactor to the new Manicougan power complex falls into the hands of the Mysterons who intend to use it to strike the Atlantic Seaboard of North America.

When the Mysterons threaten to destroy President Roberts within twelve hours, Captain Scarlet is assigned to guard the skeptical President of the United States.

The Mysterons threaten to destroy the Triumvirate of Europe, the three most powerful men on Earth after the World President.

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.