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• S15.E1 ∙ The Mystery of Nan Madol
• S15.E2 ∙ The Relics of Roswell
• S15.E3 ∙ Destination Chile
• S15.E4 ∙ The Real Men in Black
• S15.E5 ∙ The Mystery of the Stone Giants
• S15.E6 ∙ The World Before Time
• S15.E7 ∙ They Came from The Pleiades
• S15.E8 ∙ The Immortality Machine
• S15.E9 ∙ The Shapeshifters
• S15.E10 ∙ The Mystery of Skinwalker Ranch
• S15.E11 ∙ The Ultimate Guide to UFOs
• S15.E12 ∙ Aliens and the Presidents