Researchers claim hidden messages can be found within the works of Leonardo da Vinci, and other art throughout history, that may reveal an extraterrestrial influence.
| Name | Type | Role | |
|---|---|---|---|
| Max Thompson | Writer | ||
| Nadia Nikolic Bowen | Writer | ||
| Joseph Maddrey | Writer | ||
| Kevin Burns | Writer | ||
| Nadia Nikolic Bowen | Producer | Supervising Producer | |
| Jon Lomberg | Guest Star | Self - Design Director, Voyager Record | |
| Lynn Picknett | Guest Star | Self - Co-Author, The Templar Revelation | |
| Godfrey Harris | Guest Star | Self - Author, The Legacy of Leonardo Da Vinci | |
| Giorgio A. Tsoukalos | Guest Star | Self - Publisher, Legendary Times Magazine | |
| Maurizio Seracini | Guest Star | Self - Professor of Art Imaging, SDSU | |
| William Michael Roberts | Guest Star | Self - Italian Translator | |
| William Henry | Guest Star | Self - Author/Investigative Mythologist | |
| Caroline Cory | Guest Star | Self - Author, The Visible and Invisible Worlds | |
| George Noory | Guest Star | Self - Radio Host, Coast to Coast AM | |
| Giovanni Pala | Guest Star | Self - Author, Leonardo: The Ultimate Secret | |
| Michael Kwakkelstein | Guest Star | Self - Research Institute Director, Utrecht University | |
| David Childress | Guest Star | Self - Author, Technology of the Gods | |
| Jonathan Young | Guest Star | Self - Founding Curator, Joseph Campbell Archives | |
| Layne Little | Guest Star | Self - Professor of Religious Studies, UCD | |
| Noah Charney | Guest Star | Self - Author, The Thefts of the Mona Lisa | |
| Katy Blatt | Guest Star | Self - Author, Leonardo Da Vinci and the Virgin of the Rocks | |
| Matthew Landrus | Guest Star | Self - Faculty of History, University of Oxford | |
| David Silver | Executive Producer | ||
| Kevin Burns | Executive Producer | ||
| Max Thompson | Executive Producer | ||
| Giorgio A. Tsoukalos | Executive Producer | Co-Executive Producer | |
| Kim Sheerin | Executive Producer | ||
| Susan E. Leventhal | Executive Producer | for HISTORY |