Captain Black mistakes a Mysteron camera for a cannon, which I understand since it looks like one, and attacks a Mysteron complex. The Mysterons misunderstand and start a war of nerves, putting Captain Black under their control. They threaten to kill the World President. Captain Scarlet and Brown are killed and reconstructed by the Mysterons. The first attempt fails, and during the second attempt Colonel White discovers that the Captain Brown that escorted the president wasn't really Captain Brown, and that Captain Scarlet is under the control of the Mysterons as well. This means the President is in danger. Written by movieguy3

The Mysterons target the Director General of the United Asian Republic. After a failed assassination attempt, the Mysterons destroy and rebuild a DT-19 aircraft to aid their mission. Captain Scarlet returns to duty, apparently now virtually indestructible, but will this be enough to stop the Mysterons?

A nuclear device is stolen while being transported through London and it doesn't take long for the Mysterons to announce the city itself as their latest target. All Spectrum have to go on is a lead from the driver of the nuclear transporter, who claims that he heard Big Ben strike thirteen times. With time running out, can Spectrum use this cryptic clue to find the device before it's too late?

The Mysterons make their first mistake when Captain Black, revealed to have become a Mysteron agent, breaks into the Culver Atomic Centre and is exposed to radioactivity that will enable Spectrum to track him with directional geiger counters. Written by Anonymous

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

Colonel White leaves Cloudbase after the Mysterons threaten to kill him, reasoning that such a threat endangers the other members of Spectrum. He takes refuge on board a submarine and is assigned protection in the form of Ensign Soames. However, neither the crew nor the Colonel realize that Soames is a Mysteron agent. With the Mysterons seemingly free to carry out their threat, could this be the end for Colonel White?

Following the latest Mysteron threat, Scarlet is dispatched to supervise security at the International Air Conference at Glen Garry Castle.

The Mysterons announce that they are going to kill time. This baffling statement has Spectrum following up countless leads until Captain Magenta guesses the answer. The Spectrum forces prioritize the security of General Tiempo, whom they believe to be the Mysterons target and who is scheduled to undergo revolutionary surgery at the hands of Doctor Magnus. Unbeknownst to Spectrum, Magnus is a Mysteron agent and the General's life is in greater danger than they think.

Spectrum Intelligence reveals two new anti Mysteron gadgets (A Mysteron detector and a Mysteron gun) developed from previous knowledge of the Mysterons. These are The Mysterons, however, have different ideas. When Spectrum discover that Captain Indigo is in the hands of the Mysterons, Captain Scarlet is sent after him. However, he has a time limit; Indigo has activated the lift mechanism and nicked the master key, trapping everyone below the lodge as the elevator can't be used at the same time as the lift mechanism. Can Scarlet get the key back and reverse the direction of the lift mechanism before Captain Blue, Colonel White, Dr Giadello, General Peterson and the World President are crushed? Written by movieguy3

The Mysterons threaten to obliterate North America, but Spectrum is left without its number one agent when Scarlet is dismissed for gambling offences.

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

When the Lunar Controller announces the Moon's independence from Earth in the war of nerves with the Mysterons, Scarlet, Blue and Green journey to Lunarville 7 to investigate reports of an unauthorised complex under construction in the Humboldt Sea. Written by Anonymous

The Supreme Commander of Earth Forces is threatened with death by the Mysterons. Scarlet and Blue escort him to a briefing at SHEF, narrowly averting an assassination attempt. Moving the Supreme Commander to a fortified bunker in the desert, Spectrum faces an even greater challenge: the new Unitron tank has been programmed to destroy the Supreme Commander at all costs.

The Mysterons target fashion designer Andre Verdain, secret controller of the European Area Intelligence Service.

When the Mysterons threaten to kill one of the Angels, Scarlet and Blue are sent to Paris to escort Destiny back to Cloudbase.

The Mysterons engineer the launch of a Variable Geometry Rocket from Base Concord and their agent, Major Reeves, escapes with the destruct mechanism and target information.

Scarlet, Blue and Green volunteer for a dangerous mission to remove the power source of the Mysteron complex in Crater 101 before it is destroyed by a low yield atomic device.

Astronomers at K14 Observatory are monitoring signals from a hidden satellite that has made a successful landing on the Martian moon Phobos.

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.

When the Mysterons threaten to immobilise the whole of Spectrum, Scarlet and Blue are sent to the Spectrum oil refinery at Bensheba.

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.

Mysteron agent Judith Chapman steals a phial of deadly K14 virus - enough to kill ten million people - from Biological Research Station D near Manchester.

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

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

When the Mysterons threaten to destroy President Roberts within twelve hours, Scarlet is assigned as bodyguard to the sceptical President.

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

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.

The ultimate mind game is unleashed, Spectrum, turned against itself. Captains Scarlet and Blue travel to outback Australia in a desperate attempt to unravel the Mysteron plans before it is too late.

When the Mysterons threaten to destroy the World Navy Complex at Atlantica, Blue and Ochre fly a V17 Air Force bomber to destroy a wreck that has been sighted drifting towards the base.

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.