On April 10, 2015, the series returned to History after H2 was relaunched as Vice on TV. In some foreign markets, the series still carries the Ancient Aliens: The Series title card. The packaged several episodes focusing on the 2012 phenomenon. A package of thirteen episodes were made available for syndication in the United States and Canada during the 2011–12 television season. Frequent re-airings of episodes continued on the main channel, with highlights and selected episodes airing on A&E and Lifetime. Ancient Aliens: The Series aired on History from 2010 to 2011, then moved to H2 where it was promoted as one of the network's flagship series until 2014. Originally broadcast March 8, 2009, the special was re-run several times and is now packaged with the series as its pilot episode. The series was launched as a two-hour documentary special for the History Channel. Scott Littleton served as a producing consultant during the series development until his death in 2010. Giorgio Tsoukalos serves as consulting producer, and is a permanent guest, appearing in every episode.
The executive producer of Ancient Aliens is Kevin Burns, who also directed and wrote the pilot episode. Brian Dunning debunked the series as "a slap in the face to the ingenuity of the human race". The series has been criticized by the Smithsonian, among others, for overwhelming the viewer with "fictions and distortions" by using a Gish gallop. He later told Inverse that he "was dubious about the whole thing", adding, "something's going on". William Shatner, who narrated the 1976 documentary Mysteries of the Gods, appeared in the Season 16 episode "William Shatner Meets Ancient Aliens ". Action Bronson has reacted to the series in two seasons of Vice's Action Bronson Watches Ancient Aliens. The series was parodied in the 2011 South Park episode " A History Channel Thanksgiving". An eighteenth season began airing in January 2022. The series continued with its sixteenth season in November 2020. Due to COVID-19 disrupting production, the season ended after only 12 episodes, however only 10 episodes aired. In 2015, the series returned to History after H2 was relaunched as Vice on TV. Seasons 4 to 7 aired on H2, with frequent re-airings of episodes on History and other A&E services. The series began as a two-hour documentary special in 2009, and continued for three seasons as a flagship series on History. Producer Giorgio Tsoukalos and writer David Childress are featured guests. The works of Graham Hancock, Robert Bauval, Brinsley Le Poer Trench, Charles Hapgood, and Edgar Cayce, are also referenced in many episodes. The series is based on and inspired by the works of Erich von Däniken and Zecharia Sitchin, among other writers. The series has been a target for criticism of History's channel drift, and for promoting unorthodox or unproven hypotheses as fact. Produced by Prometheus Entertainment, the series has aired on History and other A&E Networks since 2010. Episodes, narrated by Robert Clotworthy, begin and end with rhetorical questions.
Ancient Aliens is an American television series that explores the ancient astronauts hypothesis, past human- extraterrestrial contact, UFOs, government conspiracies, and related pseudoscientific topics, such as remote viewing and psychic phenomena, in a non-critical, documentary format.