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S4 E1 - The Mayan Conspiracy
S4 E2 - The Doomsday Prophecies
S4 E3 - The Greys
S4 E4 - Aliens and Mega-Disasters
S4 E5 - The NASA Connection
S4 E6 - The Mystery of Puma Punku
S4 E7 - Aliens and Bigfoot
S4 E8 - The Da Vinci Conspiracy
S4 E9 - The Time Travelers
S4 E10 - Aliens and Dinosaurs
Videos: Trailers, Teasers, Featurettes
Streaming, rent, or buy Ancient Aliens – Season 4:
Currently you are able to watch "Ancient Aliens - Season 4" streaming on Discovery Plus.