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Europe's legendary pine forests are under siege; an enemy is marching ruthlessly forward, determined to destroy every tree in its path; the pine processionary caterpillar is a beast that devours pine forests with military precision.

Alien Takeover

March of the Caterpillars

King crabs advance over the sea floor, leaving a bleak landscape behind; they came from the Pacific but now they've moved into the Atlantic, and scientists don't know what the enormous crabs' limits might be -- and they're very worried.

Invasion of the Monster Crabs

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S1 E2 | March of the Caterpillars