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In the 22nd century, a paraplegic Marine is dispatched to the moon Pandora on a unique mission, but becomes torn between following orders and protecting an alien civilization.
A representative of an alien race that went through drastic evolution to survive its own climate change, Klaatu comes to Earth to assess whether humanity can prevent the environmental damage they have inflicted on their own planet. When barred from speaking to the United Nations, he decides humankind shall be exterminated so the planet can survive.
Years after Barry Thornton disappears from Panama while under suspicion of stealing American defense plans for the canal, his daughter Eleanor, now the ward of Barry's twin brother Dana, is still obsessed with the mystery. Senator Carew informs her that he has solved it, but he is murdered before he can give her the details.
