List of Ancient Aliens episodes

The series is based on and inspired by the works of Erich von Däniken and Zecharia Sitchin, among other writers.

The works of Graham Hancock, Robert Bauval, Brinsley Trench, Charles Hapgood, and Edgar Cayce are also referenced in many episodes.

Ancient Aliens: The Ultimate Evidence is a repackage of previously broadcast episodes presented by Giorgio Tsoukalos.

Ancient Aliens: Special Presentation features highlights from previously broadcast episodes in a 90-minute format.

Many segments from older episodes are presented in high-definition for the first time, in addition to new interview footage and special effects.

Ancient Aliens: Origins is a repackage of previously broadcast episodes in a 90-minute format, in addition to new on-location segments and interviews.