Episodes(18)
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Glacier Meltdown (S04E01)
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Destructive Forces (S04E02)
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Stone Age Apocalypse (S04E03)
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Comets (S04E04)
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Prehistoric Americans (S04E05)
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Deep Space Probes Probes (S04E06)
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Polar Apocalypse (S04E07)
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Dino Meteor (S04E08)
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Planet Storm (S04E09)
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Killer Lakes (S04E10)
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Ring of Fire (S04E11)
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Comet Mysteries (S04E12)
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Alien Safari (S04E13)
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Hyper Hurricanes (S04E14)
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Dangers of the Deep (S04E15)
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Solar Force (S04E16)
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Birth of the Solar System (S04E17)
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Hubble Trouble (S04E18)