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Currently you are able to watch "Ancient Aliens - Season 15" streaming on Hulu, HISTORY Vault Apple TV Channel, HISTORY Vault Amazon Channel, History or for free with ads on The Roku Channel. It is also possible to buy "Ancient Aliens - Season 15" as download on Apple TV.
'Ancient Aliens' examines 75 million years of the most credible alien evidence here on Earth, from the age of the dinosaurs to ancient Egypt to the skies over the western desert in the present-day USA.