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S1 • E1
After a misunderstanding on the planet Mars, a war is started between humans and an alien race called The Mysterons. Thier first act of revenge is to try and assassinate The World President.

S1 • E2
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.

S1 • E3
The Mysterons threaten to destroy the city of London and a truck carrying an atomic device goes missing and is hidden somewhere in the city. The race is on to find the truck and its missing driver before London is blown to pieces.

S1 • E4
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.

S1 • E5
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.

S1 • E6
The Mysterons threaten to kill Colonel White and after their initial attempt fails, White elects to leave Cloudbase so as not to place the other Spectrum agents in jeopardy.

S1 • E7
Following the latest Mysteron threat, Captain Scarlet is dispatched to supervise security at the International Air Conference at Glen Garry Castle in Scotland.

S1 • E8
The Mysterons' cryptic threat to "kill time" has the Spectrum personnel stumped until the target is found to be a military general who is about to undergo experimental neurosurgery.

S1 • E9
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.

S1 • E10
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.

S1 • E11
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.

S1 • E12
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.

S1 • E13
The Mysterons take control of an experimental super-tank in an attempt to assassinate the Supreme Commander of earths armed forces.

S1 • E14
Destiny and Symphony Angels go undercover as models when the Mysterons target fashion designer Andre Verdain, who is also the secret controller of the European Area Intelligence Service.

S1 • E15
When the Mysterons threaten to kill one of the Spectrum Angels, Captain Scarlet and Captain Blue are sent to Paris, where Destiny Angel is on holiday, to escort her back to the safety of Cloudbase.

S1 • E16
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.

S1 • E17
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.

S1 • E18
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.

S1 • E19
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.

S1 • E20
When the Mysterons threaten to immobilize the whole of Spectrum, Captain Scarlet and Captain Blue are sent to the Spectrum oil refinery at Bensheba to protect the fuel that powers all of Spectrums vehicles.

S1 • E21
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.

S1 • E22
Captain Scarlet and Captain Blue are tasked with escorting astrophysicist Dr. Conrad to Lake Toma, Switzerland, where he is to attend a conference discussing a possible return mission to Mars.

S1 • E23
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 an unknown city's water supply.

S1 • E24
The Mysterons threaten to stop Earth's return to Mars, so Captain's Scarlet and Blue are sent to protect a mining complex at the North Pole which is responsible for extracting Tritonium, a rare metal needed for earths space fleet.

S1 • E25
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.

S1 • E26
When the Mysterons threaten to destroy President Roberts within twelve hours, Captain Scarlet is assigned to guard the stubborn President of the United States.

S1 • E27
The Mysterons threaten to destroy the Triumvirate of Europe, the three most powerful men on Earth after the World President.

S1 • E28
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.

S1 • E29
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 there is a traitor in Spectrum are true.

S1 • E30
Spectrum personnel inexplicably take leave of their senses, due to drinking some champagne drugged by the Mysterons, who have threatened to destroy the World Navy Complex at Atlantica.

S1 • E31
After the Mysterons threaten Spectrum's Cloudbase headquarters, a large fast-moving trace appears on the radar and it looks like the Martian menace have finally come to Earth to destroy the base themselves.

S1 • E32
Whilst on a night out at a posh restaurant, Captain Blue disappears. He then awakens to find 3 months have passed and that Spectrum Security want to know if he can prove his identity by giving up top secret security codes.

Captain Scarlet

Lieutenant Green

Narrator
Symphony Angel

Harmony Angel

World President

Melody Angel

Colonel White

Lieutenant Dean
Destiny Angel