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- 第 1 季第 1 集 - The Evidence2010年4月19日1 小时 28 分钟If ancient aliens visited Earth, what was their legacy, and did they leave behind clues that exist in plain sight such as sophisticated aircraft, complex electrical grids and intricate construction machinery?免费试享 Discovery+
- 第 1 季第 2 集 - The Visitors2010年4月26日1 小时 28 分钟If ancient aliens visited Earth, who were they, and where did they come from? Possible historic evidence and beliefs are examined around the world.免费试享 Discovery+
- 第 1 季第 3 集 - The Mission2010年5月3日1 小时 28 分钟If ancient aliens visited Earth, what was their mission, and is there evidence that points to when they will return? Ancient Sumerian tablets describe an alien race, known as the Anunnaki, who came to Earth to mine for gold.免费试享 Discovery+
- 第 1 季第 4 集 - Closer Encounters2010年5月10日1 小时 28 分钟Reports of encounters with strange beings and sightings of mysterious objects in the sky have occurred throughout history. A 13th-century historical book, Otia Imperialia, includes an account of a creature descending from a flying craft.免费试享 Discovery+
- 第 1 季第 5 集 - The Return2010年5月24日1 小时 26 分钟There is evidence that suggests we experienced 20th-century alien contact. In 1942, the Battle of Los Angeles involved the US military and air defense allegedly fighting a UFO.免费试享 Discovery+
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