Calificación
Reparto

James Lurie
Narrator (voice)

Seth Shostak
Self - SETI Institute

Nick Pope
Self - U.K. Ministry of Defense

Brian De Toy
Self - Director of Defense Studies, West Point

Stephen Hawking
Self - Theoretical Physicist (archive footage)

Paul Springer
Self - USAF Air Command and Staff College

Travis Taylor
Self - Physicist & Author

Bob Boan
Self - Co-Author, Alien Invasion: How to Defend Earth

Michael Michaud
Self - Author, Contact with Alien Civilizations

Paul Parsons
Self

John Ringo
Self - Author, Live Free or Die

Mark Moffett
Self - Author: Adventures Among Ants

Dirk Schulze-Makuch
Self - Washington State University

Neil Strauss
Self - Author, Emergency

Kevin Reeve
Self - onPoint Tactical

Quay Terry
Self - Gunnery Sergeant, USMC