There is evidence that suggests we experienced 20th century alien contact. In 1942, the Battle of Los Angeles involved the US military and Air Defense allegedly fighting a UFO. WWII Allied Air Force planes were buzzed by balls of light that some think could have been extraterrestrial. And the alleged crash of a flying saucer in Roswell, New Mexico in 1947 propelled the world into the age of UFOs. For decades, some people have been searching for the sounds of extraterrestrial intelligence, while others have been sending messages out into deep space. What would happen if aliens answered... or came calling? What protocols exist to determine who would speak on behalf of mankind, and how might we communicate? What happens if they return? Some believe they already have.
| Name | Type | Role | |
|---|---|---|---|
| Kevin Burns | Writer | ||
| Brian Coughlin | Writer | ||
| Frankie Glass | Writer | ||
| Kellie Dancho | Producer | Co-Producer | |
| Frankie Glass | Producer | ||
| Sara Seager | Guest Star | Self - Prof. of Planetary Sciences, MIT | |
| Nick Pope | Guest Star | Self - British Ministry of Defence (1985-2006) | |
| L.A. Marzulli | Guest Star | Self - Author, The Alien Interviews | |
| Jeff Peckman | Guest Star | Self - Political Activist/UFO Journalist | |
| Brad Bebout | Guest Star | Self - Research Scientist, NASA Ames Research Center | |
| Ted Peters | Guest Star | Self - Prof. of Theology, Pacific Lutheran Theological Seminary | |
| Philip Coppens | Guest Star | Self - Author/Investigative Journalist | |
| Dorothy Matich | Guest Star | Self - Witness, Battle of Los Angeles | |
| Jennifer Heldmann | Guest Star | Self - Planetary Scientist, NASA Ames Research Center | |
| Robert H. Frisbee | Guest Star | Self - Propulsion Systems Engineer, NASA-JPL, Ret. | |
| Steven M. Greer | Guest Star | Self - Director, The Disclosure Project | |
| George Noory | Guest Star | Self - Radio Host, Coast to Coast AM | |
| Michael Cremo | Guest Star | Self - Author, Forbidden Archaeology | |
| Robert Bauval | Guest Star | Self - Author, The Egypt Code | |
| Graham Hancock | Guest Star | Self - Author, Fingerprints of the Gods | |
| Albert W. Metz | Guest Star | Self - Witness, Battle of Los Angeles | |
| Bill Birnes | Guest Star | Self - Author/UFO Investigator | |
| Linda Moulton Howe | Guest Star | Self - Author/Investigative Journalist | |
| William J. Fulco | Guest Star | Self - Archaeologist, Loyola Marymount Univ. | |
| Paul Levinson | Guest Star | Self - Prof. of Media Studies, Fordham Univ. | |
| Paul Davies | Guest Star | Self - Theoretical Physicist, Arizona State Univ. | |
| Robert R. Cargill | Guest Star | Self - Biblical Archaeologist, UCLA | |
| Tom Horsfall | Guest Star | Self - Witness, Battle of Los Angeles | |
| Albert A. Harrison | Guest Star | Self - Prof. Emeritus of Social Psychology, UC Davis | |
| Julie Shuster | Guest Star | Self - Executive Director, International UFO Museum | |
| Christopher 'Chris' Pittman | Guest Star | Self - UFO Investigator | |
| Christopher 'Chris ' J. Corbally | Guest Star | Self - Vice Director, Vatican Observatory | |
| Michael Dennin | Guest Star | Self - Physicist, UC Irvine | |
| David Childress | Guest Star | Self - Author, Technology of the Gods | |
| Giorgio A. Tsoukalos | Guest Star | Self - Publisher, Legendary Times Magazine | |
| William Bramley | Guest Star | Self - Author, The Gods of Eden | |
| C. Scott Littleton | Guest Star | Self - Witness, Battle of Los Angeles | |
| Erich von Däniken | Guest Star | Self - Author, Chariots of the Gods | |
| Kim Sheerin | Executive Producer | Co-Executive Producer | |
| David Comtois | Executive Producer | Co-Executive Producer | |
| Scott Hartford | Executive Producer | Co-Executive Producer | |
| Michael Stiller | Executive Producer | for HISTORY | |
| Kevin Burns | Executive Producer |