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• S31.E1 ∙ Mars Dead or Alive
• S31.E2 ∙ Secrets of the Crocodile Caves
• S31.E3 ∙ Dogs and More Dogs
• S31.E4 ∙ Descent Into the Ice
• S31.E5 ∙ Crash of Flight 111
• S31.E6 ∙ Life and Death in the War Zone
• S31.E7 ∙ Hunt for the Supertwister
• S31.E8 ∙ World in the Balance: The People Paradox
• S31.E9 ∙ World in the Balance: China Revs Up
• S31.E10 ∙ Battle Plan Under Fire
• S31.E11 ∙ Origins: Earth Is Born
• S31.E12 ∙ Origins: How Life Began
• S31.E13 ∙ Origins: Where Are the Aliens?
• S31.E14 ∙ Origins: Back to the Beginning
• S31.E15 ∙ The Most Dangerous Woman in America
• S31.E16 ∙ America's Stone Age Explorers
• S31.E17 ∙ History's Great Escapes
• S31.E18 ∙ Ancient Refuge in the Holy Land