THIS IS THE VOICE OF THE MYSTERONS; WE KNOW THAT YOU
CAN HEAR US, EARTHMEN. OUR NEXT STRIKE IS IMMINENT. WE WILL SHOW YOU HOW WEAK
YOU REALLY ARE. WITHIN THE NEXT FOUR HOURS WE WILL DESTROY KEY LINKS IN YOUR
FROST LINE DEFENSE SYSTEM. WE WILL BE AVENGED.
A fallen tree causes repairman Eddie to skid off of an Arctic road and
down a ravine, where the Mysterons replicate him and his maintenance truck.
General Ward, the head of the Frost Line Defense, wants to launch missiles at
Mars when his bases are threatened, but Colonel White manages to talk him out of it.
Captain Scarlet and Lieutenant Green are sent to investigate when Red Deer Base loses contact with
the Frost Line Headquarters. They find that all of the men stationed there are dead, but they cannot
find any reason why. All of their tests for toxic gasses are negative, and the odd mist present
throughout the base is only water vapour.
Whilst Scarlet and Green are investigating at Red Deer, a second base, Caribou, falls victim to the
attacker. Ward threatens to launch missiles if another base is attacked.
Scarlet and Green finally discover that the air in Red Deer Base has had all the oxygen removed from
it, causing the men to asphyxiate. They deduce that the maintenance truck that recently serviced the
base is under Mysteron control, and that a device in the air conditioning system removed the
oxygen from the air. They pursue the truck to the next base in line, Big Bear, where the
security guard at the gate informs them that the truck has already been, and is headed for
Headquarters. General Ward has ordered that Spectrum personnel are to be denied access to the base.
Green knocks the guard out and removes the device in the air conditioning system before any damage
is done, whilst Scarlet pursues the maintenance truck in an SPV.
With the truck cornered, Scarlet sets off an avalanche that buries the truck before it can reach
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