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Synopsis: Watch Ancient Aliens online free. In Ancient Aliens Putlocker Full Episodes, Ancient Aliens is an American television series that premiered on April 20, 2010 on the History channel. Produced by Prometheus Entertainment, the program presents hypotheses of ancient astronauts and proposes that historical texts, archaeology and legends contain evidence of past human-extraterrestrial contact. The show has been criticized for presenting pseudoscience and pseudohistory. The series' de facto pilot was a TV special of the same name that aired on March 8, 2009. The second season began on October 28, 2010, and the third season began airing July 28, 2011. Season four premiered on February 17, 2012 but on H2 instead of the History channel. In June 2012, Giorgio A. Tsoukalos announced on Coast to Coast AM that the series has been renewed for a fifth season. Season 5 premiered on December 21, 2012.