In 2017, news breaks that the Department of Defense recently spent millions investigating reports of UFOs; the latest disclosure about a series of secret government UFO projects dating back decades.
| Name | Type | Role | |
|---|---|---|---|
| Max Thompson | Writer | ||
| Frankie Glass | Writer | ||
| Andrew Nock | Writer | ||
| Kevin Burns | Writer | ||
| JoAnn Donaldson | Guest Star | Self - Former Bio-Medical Research Engineer, NASA | |
| Michael 'Mike' Bara | Guest Star | Self - Author, Hidden Agenda | |
| Nick Pope | Guest Star | Self - U.K. Ministry of Defense (1985-2006) | |
| Robert M. Wood | Guest Star | Self - Retired Aerospace Manager | |
| Dr. Travis Taylor | Guest Star | Self - Astrophysicist | |
| Grant Cameron | Guest Star | Self - Author, UFOs, Area 51 and Government Informants | |
| Stephen Bassett | Guest Star | Self - Executive Director, Paradigm Research Group | |
| T.D. Barnes | Guest Star | Self - Former Area 51 Special Projects Engineer | |
| Richard Dolan | Guest Star | Self - Author, UFOs and the National Security State | |
| Linda Moulton Howe | Guest Star | Self - Investigative Journalist, Earthfiles | |
| Seth Shostak | Guest Star | Self - Senior Astronomer, SETI Institute | |
| Larry Holcombe | Guest Star | Self - Author, The Presidents and UFOs | |
| David Whitehead | Guest Star | Self - Radio Host, The Truth Warrior | |
| Giorgio A. Tsoukalos | Guest Star | Self - Publisher, Legendary Times Magazine | |
| George Noory | Guest Star | Self - Radio Host, Coast to Coast AM | |
| Buzz Aldrin | Guest Star | Self - NASA Astronaut, Apollo 11 | |
| David Childress | Guest Star | Self - Author, Technology of the Gods | |
| Chase Kloetzke | Guest Star | Self - Former Biomechanic Engineer, U.S. Department of Defense | |
| John Podesta | Guest Star | Self - White House Chief of Staff (1998-2001) | |
| David Silver | Executive Producer | ||
| Susan E. Leventhal | Executive Producer | for HISTORY | |
| Max Thompson | Executive Producer | ||
| Kevin Burns | Executive Producer | ||
| Frankie Glass | Executive Producer | ||
| Kim Sheerin | Executive Producer | ||
| Giorgio A. Tsoukalos | Executive Producer | Co-Executive Producer |