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In WWI, for the first time ever, -

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- nations combined to fight nations,
using the crude weapons of the day.

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WWII involved every continent.
Science provided new tools of war.

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These reached an unparalleled peak
in their capacity for destruction.

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Now, fraught with the
terrible weapons of super-science, -

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- menacing every creature
on Earth, comes...

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No one would have believed -

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- human affairs were being closely
watched by a greater intelligence.

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00:01:47,440 --> 00:01:51,877
Yet, across the gulf of space
on the planet Mars, -

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- intellects vast and unsympathetic
regarded our Earth enviously, -

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- slowly and surely
drawing their plans against us.

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Mars is more than 140 million miles
from the sun.

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For centuries it has been
in the last stages of exhaustion.

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At night, temperatures drop
far below zero, even at its equator.

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The inhabitants of this dying planet
looked across space with instruments -

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- of which
we have scarcely dreamed, -

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- searching for another world
to which they could migrate.

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They could not go to Pluto, -

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- so cold that its atmosphere
lies  ...