Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena.
| Name | Type | Role | |
|---|---|---|---|
| Evie Shapiro | Writer | ||
| Kevin Burns | Writer | ||
| Max Thompson | Writer | ||
| Rob O'Brien | Writer | ||
| Rob O'Brien | Producer | ||
| Andrew Collins | Guest Star | Self - Author, Lightquest | |
| Linda Moulton Howe | Guest Star | Self - Investigative Journalist, Earthfiles | |
| Giorgio A. Tsoukalos | Guest Star | Self - Publisher, Legendary Times Magazine | |
| George Noory | Guest Star | Self - Radio Host, Coast to Coast AM | |
| Michael Dennin | Guest Star | Self - Physicist, Univ. of California, Irvine | |
| David Paulides | Guest Star | Self - Missing Persons Investigator | |
| Ariel Bar Tzadok | Guest Star | Self - Founder, KosherTorah School | |
| Bruce Gernon | Guest Star | Self - Pilot/Co-Author, Beyond the Bermuda Triangle | |
| John Brandenburg | Guest Star | Self - Plasma Physicist, Orbital Technologies | |
| William Henry | Guest Star | Self - Author/Investigative Mythologist | |
| Adam Norwitch | Guest Star | Self - Pilot | |
| Michio Kaku | Guest Star | Self - Author, The Future of Humanity | |
| Renato Longato | Guest Star | Self - Author, E.T. Presence | |
| Edwin 'Ed' Barnhart | Guest Star | Self - Archaeologist, Director, Maya Exploration Center | |
| David Childress | Guest Star | Self - Author, The Anti-Gravity Files | |
| Kevin Burns | Executive Producer | ||
| Kim Sheerin | Executive Producer | ||
| David Silver | Executive Producer | ||
| Susan E. Leventhal | Executive Producer | for HISTORY | |
| Max Thompson | Executive Producer | ||
| Giorgio A. Tsoukalos | Executive Producer | Co-Executive Producer |