Description :
"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?"
| 1 | Return to Antarctica | 42:11 | Watch | ||
| 2 | The Badlands Guardian | 42:12 | Watch | ||
| 3 | Element 115 | 42:10 | Watch | ||
| 4 | The Star Gods of Sirius | 42:12 | Watch | ||
| 5 | They Came from the Sea | 42:11 | Watch | ||
| 6 | Secrets of the Maya | 42:11 | Watch | ||
| 7 | The Druid Connection | 42:11 | Watch | ||
| 8 | The Reptilian Agenda | 42:10 | Watch | ||
| 9 | The Alien Infection | 42:08 | Watch | ||
| 10 | Project Hybrid | 42:12 | Watch | ||
| 11 | The Trans-Dimensionals | 42:12 | Watch | ||
| 12 | Islands of Fire | 42:27 | Watch | ||
| 13 | The Constellation Code | 42:11 | Watch | ||
| 14 | The Nuclear Agenda | 42:12 | Watch | ||
| 15 | The Alien Mountain | 42:11 | Watch | ||
| 16 | The Alien Brain | 42:12 | Watch | ||
| 17 | The Secrets of Stonehenge | 42:11 | Watch | ||
| 18 | Food of the Gods | 42:09 | Watch | ||
| 19 | Human Hieroglyphs | 42:12 | Watch | ||
| 20 | The Storming of Area 51 | 42:11 | Watch | ||
| 21 | Countdown to Disclosure | 42:11 | Watch | ||
| 22 | Secrets of the Exoplanets | 42:12 | Watch | ||
| 23 | Ancient Aliens S12 Sneak Peek | 02:02 | Watch |
