"From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode in this hit HISTORY series gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate. Did intelligent beings from outer space visit Earth thousands of years ago?"
| Title | Time | ||
|---|---|---|---|
| 1 | Return to Antarctica | 42:11 | Buy on Amazon |
| 2 | The Badlands Guardian | 42:12 | Buy on Amazon |
| 3 | Element 115 | 42:10 | Buy on Amazon |
| 4 | The Star Gods of Sirius | 42:12 | Buy on Amazon |
| 5 | They Came from the Sea | 42:11 | Buy on Amazon |
| 6 | Secrets of the Maya | 42:11 | Buy on Amazon |
| 7 | The Druid Connection | 42:11 | Buy on Amazon |
| 8 | The Reptilian Agenda | 42:10 | Buy on Amazon |
| 9 | The Alien Infection | 42:08 | Buy on Amazon |
| 10 | Project Hybrid | 42:12 | Buy on Amazon |
| 11 | The Trans-Dimensionals | 42:12 | Buy on Amazon |
| 12 | Islands of Fire | 42:27 | Buy on Amazon |
| 13 | The Constellation Code | 42:11 | Buy on Amazon |
| 14 | The Nuclear Agenda | 42:12 | Buy on Amazon |
| 15 | The Alien Mountain | 42:11 | Buy on Amazon |
| 16 | The Alien Brain | 42:12 | Buy on Amazon |
| 17 | The Secrets of Stonehenge | 42:11 | Buy on Amazon |
| 18 | Food of the Gods | 42:09 | Buy on Amazon |
| 19 | Human Hieroglyphs | 42:12 | Buy on Amazon |
| 20 | The Storming of Area 51 | 42:11 | Buy on Amazon |
| 21 | Countdown to Disclosure | 42:11 | Buy on Amazon |
| 22 | Secrets of the Exoplanets | 42:12 | Buy on Amazon |
| 23 | Ancient Aliens S12 Sneak Peek | 02:02 | Buy on Amazon |
