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9. The Day The Earth Stood Still (1951)
All of Washington, D.C., is thrown into a panic when an extraterrestrial spacecraft lands near the White House. Out steps Klaatu, a handsome and soft-spoken interplanetary traveler, whose "bodyguard" is Gort, a huge robot who spews forth laser-like death rays when danger threatens. After being wounded by an overzealous soldier, Klaatu announces that he has a message of the gravest importance for all humankind, which he will deliver only when all the leaders of all nations will agree to meet with him.