TV Century 21

As part of the promotion for the show in February 2005, presspacks included a brief episode guide to the 26 episodes of season one, character profiles as well as equipment profiles. This article contains the episode summaries of the episodes from season one.

Interestingly, the episodes are not in the same sequence as they are being transmitted in the UK.  I can understand episodes get reshuffled when they take 10 days to film, but thse have been completed for a while now.
Episode 1: INSTRUMENT OF DESTRUCTION (PART ONE)

Mysterious signals lead Spectrum agents Captain Scarlet and Captain Black to Mars, and the dawn of a war of terror with evil invisible aliens, the Mysterons. A war in which both men will play lead rolls – on opposing sides.
[first episode broadcast]

Episode 2: INSTRUMENT OF DESTRUCTION (PART TWO)

Captain Scarlet, free of Mysteron control, but made virtually indestructible by them, begins a desperate search for the aliens’ instrument of destruction, Captain Black – and must stop a countdown to the end of the world!
[second episode broadcast]

Episode 3: RAIN OF TERROR

Experiments into rainfall stimulation are hi-jacked by the Mysterons, and Captain Scarlet and Colonel White face a terror that falls from the skies.

Episode 4: MERCURY FALLING

Captain Blue and Destiny Angel are stranded above the Earth in an orbiting space shuttle controlled by a crook with a plan to blackmail Washington. Things can only get worse when Captain Black intervenes.
[sixth episode broadcast]

Episode 5: THE HOMECOMING

Fifteen years after he went missing on the first manned mission to Jupiter, Lieutenant Green’s father returns to Earth in a cryogenic sleep – but is it really him?
[fifth episode broadcast]

Episode 6: CHILLER

Captain Scarlet discovers a plot to destroy Skybase. But when Mysteron agents try to kill him, Scarlet wakes up in Skybase sickbay and finds a grieving Destiny Angel – and no-one can see or hear him. Is virtually indestructible Scarlet dead? Can he save Skybase from beyond the grave?

Episode 7: RAT TRAP

Captain Scarlet leads a rescue mission when Spectrum loses contact with its base on Mars. But Scarlet, Blue, Destiny, Harmony and Dr Gold find themselves trapped by a deadly intelligence.
[fourth episode broadcast]

Episode 8: TOUCH OF THE REAPER

Two scientists are replicated by the Mysterons as assassins infected with a disease that can kill with just one touch. Scarlet and Blue are pitched into a hunt against the clock to find them – but the Mysterons have a trick up their sleeve.

Episode 9: TO TRAP A RHINO  

Harmony investigates the report of a UFO sighting in Scotland and finds herself the bait in a Mysteron plan to destroy a nuclear power station.

Episode 10: CIRCLES OF DOOM

The Angels have a close escape when on-board electronic systems fail. Scarlet and Blue find a connection with crop circles appearing in southern England – and the only way to stop Captain Black is a piece of history.

Episode 11: SWARM

Skybase is invaded by a swarm of deadly robotic bugs, and Lieutenant Green could be all that lies between survival and destruction for the whole of Spectrum.
[third episode broadcast]

Episode 12: HEIST

Colonel White’s daughter is kidnapped. But is it a plot by crooks to force him to help them rob a bullion train with a Rhino, or are the Mysterons playing a more sinister game?

Episode 13: VIRUS

Scarlet finds himself pitted against a computer virus that can kill.

Episode 14: SKIN DEEP

When missile launch codes are stolen from a military base Destiny is identified by security cameras as the thief. Have the Mysterons taken her over? Scarlet must find out.

Episode 15: THE ACHILLES MESSENGER

The Mysterons range massive forces against a rebel that takes over the body of a woman in order to bring the war with Earth to an end. Scarlet must protect her at all costs.

Episode 16: PROTEUS

Trapped aboard Proteus, a state of the art stealth warship controlled by the Myterons, Scarlet, Colonel White and Lieutenant Green have to evade being caught by a pack of deadly robots and stop the aliens triggering a new world war.

Episode 17: CONTACT

When scientist Phil Bogart disappears with a matter disrupter bomb, Scarlet and Blue have to rely on a telepathic link with his brother Frank to find him. But Frank Bogart is a convict with his mind set on escape.

Episode 18: FALLEN ANGELS

Angels Destiny, Harmony and Melody are stranded on a tropical island for 24 hours, but paradise soon turns sour when they find themselves being hunted by Mysteron-controlled pirates.

Episode 19: ENIGMA

An alien spacecraft crashes into the Australian desert. Spectrum investigates, and Scarlet is offered a chance to stop the war with the Mysterons before it even starts.

Episode 20: BEST OF ENEMIES

Scarlet and Black agree an uneasy truce when they find themselves trapped and must work together to escape an icy grave – but just how much can Scarlet trust his one-time friend turned mortal enemy?

Episode 21: SYRTIS MAJOR

Vulcan Industries breaks the UN exclusion order on Mars and sends a maintenance team to its closed-down Martian operation. When Scarlet leads a team to bring them back, its survival is put in Destiny’s hands.

Episode 22: SHAPESHIFTER

Scarlet apparently attempts to assassinate Colonel White, but as Blue leads a search for him in Cajun Louisiana, an unstoppable chameleon force is stalking the decks of Skybase – and only one man can destroy it.

Episode 23: THE STORM AT THE END OF THE WORLD

Scarlet and Blue track a rogue Russian Druzynik tank into Alaska and discover an entire town that’s been taken over by the Mysterons. Then Scarlet is forced to make a life or death choice between his friend and the future of the entire human race!

Episode 24: DUEL

Destiny and Lieutenant Green are taking a vacation at Serendipity, an artificial beach resort in a lunar biosphere but Scarlet uncovers a plan to destroy it – and finds himself caught in a duel for survival on the lunar surface with Captain Black.

Episode 25: HOUSE OF DOLLS

Scarlet is on a camping holiday with his sister and her son, but when they escape a Mysteron attack on the highway their nightmare is only just beginning. They take refuge with toy collector Alexander Woodchurch and discover that some toys are not for playing with.

Episode 26: DOMINION

When Scarlet takes Black captive the former Spectrum agent appears to have escaped the control of the Mysterons. Black claims his knowledge of the Mysterons can destroy them and urges Scarlet to return to Mars with him and end the war he began. But can Scarlet trust him?