According to some Ancient Astronaut theorists, entities that have been described as ghosts, angels and extraterrestrials are actually visitors from unseen realms and they walk on Earth.
| Name | Type | Role | |
|---|---|---|---|
| Mitch Marcus | Writer | ||
| Kevin Burns | Writer | ||
| Max Thompson | Writer | ||
| Kristina Djokic | Writer | ||
| Mitch Marcus | Producer | ||
| Christopher 'Chris' Pittman | Guest Star | Self - UFO Historian | |
| Michio Kaku | Guest Star | Self - Author, The Future of Humanity | |
| Caroline Cory | Guest Star | Self - Author, The Visible and Invisible Worlds | |
| John Vivanco | Guest Star | Self - Author, The Time Before the Secret Words | |
| David Childress | Guest Star | Self - Author, Technology of the Gods | |
| Michael Dennin | Guest Star | Self - Physicist, Univ. of California, Irvine | |
| Nick Pope | Guest Star | Self - U.K. Ministry of Defense (1985-2006) | |
| William Henry | Guest Star | Self - Author/Investigative Mythologist | |
| John Brandenburg | Guest Star | Self - Plasma Physicist, Orbital Technologies | |
| Peter Maxwell Slattery | Guest Star | Self - Author, The E.T. Contact Experience | |
| Giorgio A. Tsoukalos | Guest Star | Self - Publisher, Legendary Times Magazine | |
| Christopher Bader | Guest Star | Self - Professor of Sociology, Chapman University | |
| Jonathan Young | Guest Star | Self - Founding Curator, Joseph Campbell Archives | |
| Adam Wallberg | Guest Star | Self - Skywatch Team | |
| Ariel Bar Tzadok | Guest Star | Self - Founder, KosherTorah School | |
| Daniel McQueen | Guest Star | Self - Executive Director, Medicinal Mindfulness | |
| Max Thompson | Executive Producer | ||
| Susan E. Leventhal | Executive Producer | for HISTORY | |
| Kim Sheerin | Executive Producer | ||
| Giorgio A. Tsoukalos | Executive Producer | Co-Executive Producer | |
| Anthony Fiorino | Executive Producer | ||
| Kevin Burns | Executive Producer | ||
| David Silver | Executive Producer |