Traitor
The finger of blame points at Captain Scarlet after a series of hovercraft accidents.
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More from this season
S1 E1
The Mysterons
A manned expedition led by Captain Black of Spectrum lands on Mars; investigating the planet surface in an exploration vehicle, the crew discover a futuristic alien city.
S1 E2
Winged Assassin
The Mysterons threaten the life of the Director General of the United Asian Republic and Spectrum swings into action to protect him as he prepares to board his private plane at London Airport.
S1 E3
Big Ben Strikes Again
The Mysterons threaten to destroy London and a truck carrying an atomic device goes missing in the city. The only clue to its whereabouts is the truck driver, found unconscious in the street
S1 E4
Manhunt
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.