Megalithic monuments linked together by electromagnetic energy... Prehistoric ruins arranged across vast distances in straight lines... And advanced mathematics carved into landmarks more than 5000 years ago. Were ancient man's spectacular structures built by humans alone? Or do they bear evidence of being designed--and interconnected--by otherworldly visitors?
| Name | Type | Role | |
|---|---|---|---|
| Rich Monahan | Writer | ||
| Kaylan Eggert | Writer | ||
| Rich Monahan | Producer | Supervising Producer | |
| Tree Wright | Producer | ||
| Michael Dennin | Guest Star | Self - Physicist, UC Irvine | |
| Peter Fiebag | Guest Star | Self - Author, Eternity Machine | |
| Giorgio A. Tsoukalos | Guest Star | Self - Publisher, Legendary Times Magazine | |
| Christopher Knight | Guest Star | Self - Author, Before the Pyramids | |
| Hugh Newman | Guest Star | Self - Author, Earth Grids | |
| Erich von Däniken | Guest Star | Self - Author, Chariots of the Gods | |
| Anthony Murphy | Guest Star | Self - Author, Island of the Setting Sun | |
| Adrian Gilbert | Guest Star | Self - Author, Magi: The Quest for a Secret Tradition | |
| David Childress | Guest Star | Self - Author, Technology of the Gods | |
| Bill Birnes | Guest Star | Self - Author/Publisher, UFO Magazine | |
| Andrew Collins | Guest Star | Self - Author, The Cygnus Mystery | |
| Jason Martell | Guest Star | Self - Author, Knowledge Apocalypse | |
| Bethe Hagens | Guest Star | Self - Anthropologist, Goddard College | |
| Sara Seager | Guest Star | Self - Prof. of Planetary Sciences, MIT | |
| George Noory | Guest Star | Self - Radio Host, Coast to Coast AM | |
| Philip Coppens | Guest Star | Self - Author, The Ancient Alien Question | |
| Linda Moulton Howe | Guest Star | Self - Investigative Journalist, Earthfiles | |
| Michael 'Mike' Bara | Guest Star | Self - Author, The Choice | |
| Nick Redfern | Guest Star | Self - Author, The Real Men in Black | |
| Robert Bauval | Guest Star | Self - Co-Author, Black Genesis | |
| Susan E. Leventhal | Executive Producer | for HISTORY | |
| Scott Hartford | Executive Producer | Co-Executive Producer | |
| Kim Sheerin | Executive Producer | Co-Executive Producer | |
| Kevin Burns | Executive Producer |