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古代外星人理论家认为在数千年前，外星人登陆地球，在那时他们被奉为神明，并且帮助塑造了人类文明。但有什么证据可以证明这种遭遇呢？ Ancient alien theorists believe that thousands of years ago, extraterrestrials landed on Earth, where they were hailed as gods and helped shape human civilization. But what proof could possibly exist for such an encounter? 第十七季 (播出目录) (2021) Season 17 , S17E01 ...。After the American Army shot down a UFO in 1947, generations of elite commandos were secretly trained to deal with the aliens' feared return. However, the extra-terrestrials never came back and the elite force was disbanded. Sixty-six years after the Roswell crash, the aliens are invading Earth and only the over-the-hill retired commandos can stop them.。